ABCDS™ Framework Explained Testosteronology Society™

The ABCDS™ Framework is Dr. Thomas O’Connor’s system for organizing high impact health data into a practical structure that patients and clinicians can follow over time. It exists because most people receive laboratory results as disconnected numbers, and then make decisions based on isolated values without understanding how body systems interact. ABCDS™ solves that problem by grouping related markers into physiologic domains that influence one another through metabolism, vascular function, kidney filtration, cardiac workload, oxygen delivery, and iron biology. When these domains are tracked together across time, the patterns become clearer, the tradeoffs become visible, and interpretation becomes more consistent.

Within the Testosteronology® approach, the ABCDS™ system is especially important because hormone and androgen signaling interacts with each domain. Testosterone can influence insulin sensitivity, body composition, lipid transport, vascular tone, kidney perfusion, and red blood cell production, and those influences can be helpful, neutral, or destabilizing depending on the individual’s baseline physiology and trend direction. The framework supports disciplined monitoring by making it easier to see whether a change that looks good in one place is creating strain in another place. It also supports education, because members can learn what each marker represents, how it is measured, and why it matters without needing a medical background.

As part of the Testosteronology® site experience, members can order blood work through the Health Services area and track results over time inside a single organized framework. Marker values can be entered and viewed as trends, which helps members see stability, gradual drift, and long term patterns. This matters because many health problems develop through slow shifts, not sudden emergencies, and trend based understanding is often more actionable than one time interpretation.

This guide explains the ABCDS™ categories, the markers inside each category, the typical reference ranges clinicians use as starting points, and the most common interpretation patterns that matter for long term outcomes. This is educational content and is not a substitute for medical care, diagnosis, or individualized treatment decisions.

How To Use The ABCDS™ Framework

Start by thinking in systems rather than single numbers. ABCDS™ works best when you look for direction, pattern, and context. A one time value can be misleading if it is measured during illness, after poor sleep, during dehydration, after travel, or during unusual stress. A trend across multiple checks usually tells a clearer story than a single result.

Use three interpretation layers for every marker. The first layer is the unit and measurement method, because numbers only have meaning when you know what was measured and how. The second layer is the reference range, because it provides a starting point for comparison, even though it does not always represent an optimal target for every person. The third layer is the systems context, because the same value can carry different meaning depending on what is happening in adjacent ABCDS™ categories.

Finally, remember that men and women can show different patterns with the same marker. Hormone environments differ, baseline hematology differs, and cardiovascular risk patterns can differ, so interpretation is never identical across sexes. The ABCDS™ framework helps you integrate those differences without needing separate competing checklists.

What Each Letter Represents

A stands for glycemic health and metabolic exposure to glucose over short and longer horizons. This category focuses on how stable glucose regulation is over time and whether there are early signals of insulin resistance or rising metabolic strain.

B stands for heart brain kidney function, which centers on pressure regulation, filtration quality, and early vascular stress signals. This category matters because vascular strain and kidney filtration changes often appear before symptoms and can influence multiple downstream risks.

C stands for cardiovascular health, which includes lipid transport markers and structural evidence of cardiovascular exposure. This category connects what the bloodstream is carrying with what the heart and coronary arteries are showing through imaging or functional measurement.

D stands for hematologic balance and iron metabolism, which describes oxygen carrying capacity, red blood cell concentration, and iron supply and storage. This category is especially relevant in androgen influenced care because testosterone can stimulate erythropoiesis and shift iron utilization.

S stands for screening and structure, which includes structural tests and key indicators that translate risk into observable tissue level reality. In your current marker set, coronary calcium scoring and echocardiography can be treated as both C and S elements, since they add structural context to lipid numbers and vascular exposure.

A: Glycemic Health Score

The A category evaluates glycemic regulation and metabolic efficiency. Glucose is a central energy currency, but it is also a vascular stressor when exposure is chronically elevated. Higher glucose exposure can affect the lining of blood vessels, increase oxidative stress, and amplify inflammation over time, especially when combined with adverse lipid patterns or elevated blood pressure. Even when people feel fine, glycemic drift can silently increase long term cardiovascular and kidney risk.

From a Testosteronology® perspective, glycemic status also interacts with androgen signaling through muscle mass, fat distribution, insulin sensitivity, sleep quality, and training recovery. Some people see improvements in body composition and insulin sensitivity when hormonal balance improves, while others see glycemic stress worsen if lifestyle factors, sleep disruption, or medication patterns are not aligned. That is why A markers are most useful when interpreted with trends and with the other ABCDS™ categories.

A Marker: Hemoglobin A1C

What it measures and why it matters. Hemoglobin A1C estimates average glucose exposure over roughly the prior 8 to 12 weeks by measuring the percentage of hemoglobin that has glucose attached. Because red blood cells circulate for weeks, A1C reflects longer term glucose exposure rather than day to day variation.

Common reference ranges used in many labs. A1C below 5.7 percent is often labeled normal. A1C from 5.7 to 6.4 percent is often labeled prediabetes. A1C at or above 6.5 percent is commonly consistent with diabetes when confirmed appropriately. These are clinical thresholds, not personal destiny, and the ABCDS™ lens emphasizes direction and context.

Interpretation patterns that matter in ABCDS™. Rising A1C over time often pairs with rising triglycerides, lower HDL, higher blood pressure, and early kidney stress signals such as elevated UACR. If A1C is rising while fasting glucose looks normal, consider that post meal glucose exposure may be contributing, or that variability is increasing even when fasting readings look reassuring. If A1C is stable but other markers worsen, it can still be helpful to evaluate sleep, stress, and inflammatory context because glucose is only one part of metabolic risk.

Units. A1C is reported as a percentage.

A Marker: Fasting Glucose

What it measures and why it matters. Fasting glucose is a short horizon measurement that reflects the glucose level after approximately 8 to 12 hours without calories. It captures one point in time and can be influenced by sleep, stress hormones, illness, hydration status, and recent training load, so it is best interpreted alongside A1C.

Common reference ranges used in many labs. Many labs list about 70 to 99 mg per dL as a typical fasting range. Values from 100 to 125 mg per dL are often labeled impaired fasting glucose. Values at or above 126 mg per dL may indicate diabetes when confirmed appropriately.

Interpretation patterns that matter in ABCDS™. If fasting glucose trends upward while A1C remains stable, it can suggest increasing morning glucose output, stress hormone influence, poor sleep, or early insulin resistance. If fasting glucose is normal but A1C is elevated, it can suggest post meal elevation and broader variability. In either case, trends and paired markers in C and B help clarify whether glycemic drift is driving vascular strain.

Units. Fasting glucose is reported in mg per dL.

B: Heart Brain Kidney Health Score

The B category integrates blood pressure and kidney filtration integrity. These systems are tightly linked. Blood pressure reflects how hard the vascular system is being pushed, and kidneys are highly vascular organs that filter blood continuously, so early vascular stress can show up as subtle changes in filtration markers. Meanwhile, kidney function influences blood pressure regulation through salt handling, fluid balance, and hormonal signaling.

From a Testosteronology® perspective, B is important because androgen status can influence vascular tone, red blood cell concentration, sleep quality, and cardiometabolic physiology that affects blood pressure patterns. In addition, if hematocrit rises meaningfully, blood viscosity can increase, which can influence blood pressure and vascular strain. Interpreting B alongside D is often clinically useful.

B Marker: Blood Pressure Systolic

What it measures and why it matters. Systolic blood pressure reflects the peak arterial pressure when the heart contracts. Higher systolic pressure increases vascular wall stress and is linked to long term risk for stroke, heart disease, kidney disease, and cognitive decline.

Common reference ranges used in many guidelines. A systolic value under 120 mmHg is commonly called normal. Values from 120 to 129 mmHg are often called elevated. Values from 130 to 139 mmHg are often called stage 1 hypertension. Values at or above 140 mmHg are often called stage 2 hypertension. These categories are general and should be individualized.

Interpretation patterns that matter in ABCDS™. Persistent systolic elevation is more concerning when paired with elevated UACR, abnormal cystatin C, or coronary calcium evidence of plaque. If systolic pressure rises alongside rising hematocrit, consider that viscosity and vascular resistance may be part of the pattern. If systolic pressure rises alongside worsening glycemic markers, that combination often signals metabolic vascular strain rather than a single isolated issue.

Units. Systolic pressure is reported in mmHg.

B Marker: Blood Pressure Diastolic

What it measures and why it matters. Diastolic blood pressure reflects arterial pressure between heartbeats while the heart relaxes. Elevated diastolic pressure can signal increased vascular resistance and may carry risk significance, particularly in younger individuals, while very low diastolic pressure in older individuals may reflect stiff arteries and can affect coronary perfusion.

Common reference ranges used in many guidelines. Diastolic under 80 mmHg is commonly called normal. Diastolic 80 to 89 mmHg is often called stage 1 hypertension. Diastolic at or above 90 mmHg is often called stage 2 hypertension.

Interpretation patterns that matter in ABCDS™. Diastolic elevation often pairs with stress physiology, sleep disruption, and sympathetic tone, and it may improve when lifestyle and recovery improve. When diastolic pressure is high alongside kidney filtration stress markers, that pattern can suggest a more systemic vascular issue. When diastolic is low while systolic is high, pulse pressure increases and can reflect arterial stiffness, which may correlate with coronary calcium findings over time.

Units. Diastolic pressure is reported in mmHg.

B Marker: Creatinine

What it measures and why it matters. Creatinine is a waste product from muscle metabolism that is filtered by the kidneys. Higher serum creatinine can reflect lower filtration, but it is also influenced by muscle mass, protein intake, supplements, and hydration status. That is why creatinine is best interpreted with context and often with a filtration estimate such as eGFR when available.

Common reference ranges used in many labs. Many labs list roughly 0.7 to 1.3 mg per dL as typical, but the meaningful interpretation depends on age, sex, muscle mass, and trend direction.

Interpretation patterns that matter in ABCDS™. A creatinine level that rises gradually over time can signal reduced filtration, especially if cystatin C rises too or if UACR is elevated. A single elevated creatinine during dehydration or intense training may normalize, so trend confirmation matters. A muscular man may have a creatinine that sits near the higher end of range without implying kidney dysfunction, which is one reason cystatin C can be helpful.

Units. Creatinine is reported in mg per dL.

B Marker: Cystatin C

What it measures and why it matters. Cystatin C is a protein produced by many cells and filtered by the kidneys. It is less dependent on muscle mass than creatinine, so it can provide a clearer filtration signal in people with high muscle mass or unusual creatinine production.

Common reference ranges used in many labs. Many labs list roughly 0.6 to 1.3 mg per L as a typical range, though ranges vary. Trends across time often matter more than a single value.

Interpretation patterns that matter in ABCDS™. If cystatin C is elevated alongside rising blood pressure or elevated UACR, the pattern may indicate early kidney filtration stress. If creatinine looks normal but cystatin C is elevated, it can reveal filtration changes that creatinine alone misses. If both creatinine and cystatin C are stable, that stability often supports confidence that kidney filtration is not trending in the wrong direction.

Units. Cystatin C is reported in mg per L.

B Marker: Urinalysis Protein

What it measures and why it matters. Urinalysis protein is a screening signal that checks whether protein is being lost into urine. Healthy filtration barriers prevent meaningful protein leakage. Persistent protein can signal kidney stress, vascular injury, or systemic inflammation.

Typical report values. Many reports list none, trace, 1+, or 2+ as categorical results.

Interpretation patterns that matter in ABCDS™. Trace protein may be transient after exercise or illness, but persistent protein across repeated checks deserves evaluation, especially if blood pressure is elevated or if UACR is elevated. When protein is present and UACR is also high, that combined pattern strengthens the signal that kidney filtration integrity needs attention.

Units. This is often reported as a qualitative or semi quantitative result rather than a numeric unit.

B Marker: Urine Albumin Creatinine Ratio (UACR)

What it measures and why it matters. UACR is a sensitive measure of albumin loss into urine adjusted for creatinine concentration. It is widely used to detect early kidney filtration barrier stress, often before creatinine rises.

Common reference ranges used in many labs. UACR under 30 mg per g is often considered normal. UACR from 30 to 300 mg per g is often called moderately increased albuminuria. UACR over 300 mg per g is often called severely increased albuminuria.

Interpretation patterns that matter in ABCDS™. UACR elevation often correlates with vascular strain, insulin resistance, and blood pressure stress. When A markers worsen and UACR rises, that pattern can indicate that glycemic exposure is influencing kidney microvasculature. When blood pressure rises and UACR rises, that pattern often suggests pressure and vascular stress on filtration. When UACR improves over time alongside better A and B markers, it often reflects improved vascular environment.

Units. UACR is reported in mg per g.

C: Cardiovascular Health Score

The C category is about lipid transport and cardiovascular exposure. Lipids are not just numbers, because they represent how particles carrying cholesterol and triglycerides move through the bloodstream and interact with the arterial wall. The ABCDS™ approach aims to connect lipid markers with structural context, because risk is clearer when you understand both what the bloodstream is carrying and what the arteries and heart are showing over time.

From a Testosteronology® perspective, androgens can influence body composition, insulin sensitivity, and lipid handling, but responses vary widely across individuals. Some people see triglycerides improve and HDL rise as metabolic health improves, while others see HDL remain low or LDL patterns shift depending on diet, genetics, inflammation, thyroid status, and training load. That is why the framework emphasizes ApoB, non HDL cholesterol, Lp(a), and structural measures like coronary calcium scoring and echocardiography.

C Marker: LDL C

What it measures and why it matters. LDL cholesterol is often used as a marker of cholesterol carried within LDL particles. It is commonly used as a risk proxy, but it does not directly measure particle number. In some people, LDL C and particle number move together, and in others they do not.

Common reference ranges used in many guidelines. LDL C below 100 mg per dL is often considered optimal for general populations. LDL C from 100 to 129 mg per dL is often considered near optimal. LDL C from 130 to 159 mg per dL is often considered borderline high. LDL C at 160 mg per dL or above is often considered high.

Interpretation patterns that matter in ABCDS™. LDL C is more informative when interpreted with ApoB and non HDL cholesterol. If LDL C is modest but ApoB is high, particle number may be higher than LDL C suggests. If LDL C is higher but ApoB is not elevated, risk inference may differ. Structural context such as coronary calcium score can help anchor interpretation in reality.

Units. LDL C is reported in mg per dL.

C Marker: Triglycerides

What it measures and why it matters. Triglycerides represent circulating fat molecules, often influenced by insulin sensitivity, dietary patterns, alcohol intake, liver fat, and metabolic health. Elevated triglycerides can signal metabolic strain and are often linked to lower HDL.

Common reference ranges used in many labs. Triglycerides under 150 mg per dL are often labeled normal. Values from 150 to 199 mg per dL are often labeled borderline high. Values at or above 200 mg per dL are often labeled high.

Interpretation patterns that matter in ABCDS™. Triglycerides often rise when glycemic control worsens, sleep deteriorates, or insulin resistance increases. When triglycerides rise along with A1C drift and lower HDL, the pattern often points to metabolic dysfunction rather than a purely genetic lipid pattern. When triglycerides improve alongside A markers, cardiovascular risk signals often improve across multiple domains.

Units. Triglycerides are reported in mg per dL.

C Marker: HDL C Men

What it measures and why it matters. HDL cholesterol is often discussed as protective, but HDL function and context matter. HDL is involved in reverse cholesterol transport and is often correlated with metabolic health, physical activity, and insulin sensitivity.

Common reference ranges used in many guidelines for men. HDL under 40 mg per dL is often considered low for men. Higher values are generally considered more favorable, but extremely high values do not always confer protection in every context.

Interpretation patterns that matter in ABCDS™. Low HDL in men often pairs with higher triglycerides and glycemic strain. When HDL rises as triglycerides fall and A markers improve, it often reflects better metabolic health. If HDL is low but ApoB is well controlled and structural tests are reassuring, overall risk context may differ.

Units. HDL is reported in mg per dL.

C Marker: HDL C Women

What it measures and why it matters. HDL cholesterol is influenced by sex hormones, body composition, insulin sensitivity, and genetics. Women often have higher HDL than men across many life stages, but patterns vary widely.

Common reference ranges used in many guidelines for women. HDL under 50 mg per dL is often considered low for women. Higher values are generally considered more favorable, especially when paired with good triglyceride levels and favorable ApoB.

Interpretation patterns that matter in ABCDS™. Women can have favorable HDL while still carrying risk through elevated ApoB or high Lp(a), so HDL alone should not anchor cardiovascular inference. When HDL is low in women alongside higher triglycerides, it often suggests metabolic strain and deserves broader ABCDS™ evaluation rather than an isolated lipid conversation.

Units. HDL is reported in mg per dL.

C Marker: Non HDL Cholesterol

What it measures and why it matters. Non HDL cholesterol is total cholesterol minus HDL cholesterol. It captures cholesterol carried by atherogenic particles including LDL, VLDL, IDL, and remnants. It can be a practical summary marker when ApoB is not available, though ApoB is often more precise for particle number.

Common reference ranges used in many guidelines. A common target for many adults is under 130 mg per dL, with more aggressive targets sometimes used for higher risk individuals based on clinician judgment.

Interpretation patterns that matter in ABCDS™. Non HDL can align more closely with ApoB than LDL C does in some people. If non HDL is elevated alongside higher triglycerides, it can indicate increased remnant particles. If non HDL improves while coronary calcium is stable and A and B markers are improving, the overall trend often reflects reduced vascular exposure.

Units. Non HDL is reported in mg per dL.

C Marker: ApoB

What it measures and why it matters. Apolipoprotein B is a protein found on atherogenic lipoprotein particles. Each atherogenic particle generally contains one ApoB molecule, so ApoB is often used as a proxy for particle number, which is strongly related to atherosclerotic exposure.

Common reference targets used clinically. Many clinicians view ApoB under about 90 mg per dL as a reasonable general target, with lower targets considered for higher risk individuals. Targets can vary by guideline and patient context.

Interpretation patterns that matter in ABCDS™. ApoB can clarify cases where LDL C appears acceptable but particle number is high. If ApoB is elevated and coronary calcium is present, structural context suggests that cumulative exposure is becoming real tissue level plaque. If ApoB is elevated but coronary calcium is zero, the structural context may be reassuring but does not eliminate the need for trend management.

Units. ApoB is reported in mg per dL.

C Marker: Lipoprotein(a)

What it measures and why it matters. Lp(a) is a genetically influenced lipoprotein particle that can increase cardiovascular risk independent of other lipid markers. It tends to remain relatively stable across life and is less responsive to lifestyle change, which makes it important to know even when other markers look favorable.

Common reference ranges used in practice. Many labs flag Lp(a) above about 30 mg per dL as elevated. When measured in nmol per L, thresholds vary, and many references consider values above about 75 nmol per L as elevated. Because units differ across assays, always interpret Lp(a) using the unit provided on the report.

Interpretation patterns that matter in ABCDS™. Elevated Lp(a) can explain why someone with otherwise decent LDL C has higher than expected plaque burden or family history risk. If Lp(a) is high, structural measures like coronary calcium scoring can be particularly informative for context. If Lp(a) is low, it removes one major inherited risk amplifier, but overall risk still depends on ApoB and the broader ABCDS™ pattern.

Units. Lp(a) may be reported in mg per dL or nmol per L, and the unit matters for interpretation.

S Marker: Coronary Calcium Score

What it measures and why it matters. Coronary artery calcium scoring uses CT imaging to quantify calcified plaque in the coronary arteries. It is a structural marker that turns abstract risk into visible evidence of atherosclerotic burden. It does not capture non calcified plaque directly, but it is strongly associated with long term cardiovascular risk.

Common interpretive ranges used clinically. A score of 0 indicates no detectable calcified plaque at the time of scanning. Scores from 1 to 99 are often considered mild plaque burden. Scores from 100 to 399 are often considered moderate plaque burden. Scores at or above 400 are often considered high plaque burden. Age and sex affect expected distributions, so context matters.

Interpretation patterns that matter in ABCDS™. If ApoB is high and calcium score is rising, that pattern reflects meaningful cumulative exposure translating into plaque. If ApoB is controlled and calcium score is stable, that pattern is generally reassuring. If calcium score is zero but multiple risk markers are drifting, the scan can be reassuring but should not be used as a reason to ignore trend direction.

Units. Coronary calcium score is reported in Agatston units.

S Marker: Echocardiogram Ejection Fraction

What it measures and why it matters. Ejection fraction estimates the percentage of blood the left ventricle pumps out with each contraction. It is a functional marker of systolic performance and can help contextualize symptoms like fatigue, shortness of breath, and exercise intolerance.

Common reference range used clinically. Many reports list normal ejection fraction roughly from 55 to 70 percent, though ranges vary by laboratory and method.

Interpretation patterns that matter in ABCDS™. Reduced ejection fraction can indicate impaired pumping function and should be interpreted with symptoms and broader cardiovascular evaluation. A normal ejection fraction does not rule out diastolic problems or vascular limitations, which is why diastolic assessment and B category pressure and kidney markers still matter.

Units. Ejection fraction is reported as a percentage.

S Marker: Echocardiogram Diastolic Dysfunction

What it measures and why it matters. Diastolic dysfunction refers to impaired relaxation and filling of the heart during diastole. People can have normal ejection fraction yet still have exercise intolerance or shortness of breath because filling pressures are abnormal. Diastolic function is influenced by blood pressure, stiffness, aging, metabolic health, and sometimes inflammation.

Typical report values. Many simplified reports list yes or no, while more detailed reports grade severity and provide additional parameters.

Interpretation patterns that matter in ABCDS™. Diastolic dysfunction often correlates with long term blood pressure strain, metabolic dysfunction, and arterial stiffness. When diastolic dysfunction is present alongside higher blood pressure and rising glycemic markers, it supports the interpretation that systemic strain is affecting cardiac mechanics. In those patterns, ABCDS™ emphasizes system alignment rather than isolated symptom chasing.

Units. This is usually reported as a qualitative result or graded classification.

D: Hematologic, Erythrocytosis, and Iron Metabolism Risk Score

The D category focuses on oxygen carrying capacity, red blood cell concentration, and iron availability and storage. This category matters in general health, but it becomes especially important in androgen influenced care because testosterone can stimulate erythropoiesis. When red blood cell production rises too far, blood viscosity can increase, and that can influence blood pressure, circulation, headache frequency, exercise tolerance, and vascular strain, particularly in people who already have cardiovascular risk factors.

Iron biology is inseparable from erythropoiesis. If red blood cell production increases, iron stores can be pulled down over time, and ferritin, saturation, and serum iron patterns can shift. That is why D is not only about hematocrit and hemoglobin, but also about iron supply and storage.

D Marker: Hematocrit

What it measures and why it matters. Hematocrit is the percentage of blood volume occupied by red blood cells. Higher hematocrit increases viscosity and can increase vascular resistance in some contexts.

Common reference ranges used in many labs. Many labs list a typical adult range around 38 to 50 percent, with men often higher than women, and some variation by altitude and hydration.

Interpretation patterns that matter in ABCDS™. A hematocrit that rises into the higher range while blood pressure is rising suggests a combined viscosity and pressure pattern that deserves careful monitoring. A hematocrit that is high while ferritin is dropping can suggest increased erythropoietic demand pulling down iron stores. A hematocrit that is low with low ferritin and low iron saturation may suggest iron deficiency physiology, which can affect energy, performance, and recovery even when hemoglobin is still borderline.

Units. Hematocrit is reported as a percentage.

D Marker: Hemoglobin

What it measures and why it matters. Hemoglobin is the oxygen carrying protein inside red blood cells. It reflects oxygen transport capacity and often moves with hematocrit, though they can diverge in certain conditions.

Common reference ranges used in many labs. Many labs list approximately 13 to 17.5 g per dL for adult men and about 12 to 15.5 g per dL for adult women, though ranges vary.

Interpretation patterns that matter in ABCDS™. Rising hemoglobin and hematocrit together reinforce the signal of increased red cell mass. If hemoglobin is high while ferritin and saturation decline, that pattern suggests iron is being utilized to support increased red cell production. If hemoglobin is low with low iron markers, that pattern may suggest iron deficiency anemia physiology. If hemoglobin is normal but symptoms persist, ABCDS™ encourages looking across A, B, C, and S rather than assuming the blood count is the main driver.

Units. Hemoglobin is reported in g per dL.

D Marker: Ferritin

What it measures and why it matters. Ferritin reflects iron storage. It is a key marker for understanding whether the body has iron reserves available to support red blood cell production and other metabolic needs. Ferritin can also rise with inflammation, so context matters.

Common reference ranges used in many labs. Many labs list about 30 to 400 ng per mL as a broad adult range, with variation by sex and age.

Interpretation patterns that matter in ABCDS™. Low ferritin often indicates low iron stores, especially when paired with low saturation and low serum iron. High ferritin can reflect iron overload patterns, inflammation, liver stress, or metabolic dysfunction, depending on context. If ferritin is falling while hematocrit is rising, it may suggest iron stores are being utilized to support erythropoiesis.

Units. Ferritin is reported in ng per mL.

D Marker: Iron Saturation, Transferrin Percent

What it measures and why it matters. Iron saturation estimates the percentage of transferrin carrying iron. It helps describe how much iron is available in circulation for immediate use.

Common reference ranges used in many labs. Many labs list about 20 to 50 percent as a typical range.

Interpretation patterns that matter in ABCDS™. Low saturation often suggests iron deficiency physiology, especially when ferritin is also low. High saturation may suggest increased circulating iron and can appear in certain iron overload contexts. Saturation interpretation is stronger when paired with ferritin and total iron rather than used alone.

Units. Iron saturation is reported as a percentage.

D Marker: Total Iron

What it measures and why it matters. Serum iron measures the amount of circulating iron bound to transferrin. It fluctuates throughout the day and can vary with recent intake and inflammation, so it is best interpreted alongside saturation and ferritin.

Common reference ranges used in many labs. Many labs list about 60 to 170 micrograms per dL as a typical range, though ranges vary.

Interpretation patterns that matter in ABCDS™. Low serum iron with low saturation and low ferritin supports iron deficiency physiology. Normal serum iron with low ferritin can occur early in depletion. High serum iron with high saturation may suggest increased iron availability and should be interpreted with ferritin and clinical context.

Units. Total iron is reported in micrograms per dL.

How The Letters Interact Inside One System

ABCDS™ is designed to reveal interactions, not just individual flags. Glycemic strain in A often pushes triglycerides up and HDL down in C, and over time it can stress kidney microvasculature in B, raising UACR. Blood pressure elevation in B can worsen kidney filtration signals and can also contribute to diastolic dysfunction in S. Rising hematocrit in D can amplify blood pressure stress in B and can change how the cardiovascular system tolerates workload, especially when coronary plaque burden exists in S.

Hormone and androgen signaling can influence many of these connections. Improved androgen balance can support better body composition and metabolic efficiency in some people, improving A and C patterns. In others, red cell production rises disproportionately, affecting D and potentially B. That is why ABCDS™ does not treat any category as isolated, and why long term monitoring matters more than one time interpretation.

Practical Trend Review Method For Members

Step one is to record each marker value with the test date and confirm that units match across tests. Step two is to look for drift over time rather than focusing only on whether a value is inside a reference range. Step three is to scan for paired movement across categories, such as rising A1C with rising triglycerides, or rising hematocrit with rising blood pressure. Step four is to anchor interpretation with structural context when available, such as coronary calcium score and echocardiogram findings. Step five is to share the full ABCDS™ picture with a qualified clinician who can interpret it in the context of symptoms, medications, history, and goals.

Common Questions About Ranges And Units

Ranges differ across laboratories. A reference range is not a universal biological truth, and lab methods, populations, and statistical definitions vary. That is why ABCDS™ emphasizes trend direction and systems context. If you repeat testing through the same lab and method, comparisons become more reliable, and you can more clearly see whether physiology is stable or drifting.

Some markers have different units depending on the assay. Lp(a) is the best example because it may be reported in mg per dL or nmol per L. Those are not interchangeable without assay specific conversion context. Always interpret Lp(a) using the unit and reference interval provided on the report.

What The ABCDS™ Framework Helps You Avoid

The framework helps you avoid chasing one number while ignoring system costs. It helps you avoid declaring success because a single lab improved while kidney markers, blood pressure, or red cell markers drifted in the wrong direction. It helps you avoid assuming symptom relief equals physiologic stability, because symptoms can improve while risk markers quietly worsen. It helps you avoid treating lipid markers as abstract risk without structural context, because coronary calcium and echocardiography often reveal whether risk has translated into tissue reality.

It also helps you avoid overreacting to a single abnormal value when the broader system is stable. Many fluctuations can be transient. ABCDS™ encourages a disciplined approach that balances vigilance with context and trend confirmation.

Summary And Next Steps

The Testosteronology® ABCDS™ Framework organizes complex medical data into a coherent system that reflects how physiology behaves across time. A focuses on glucose exposure and metabolic efficiency. B captures pressure regulation and kidney filtration integrity, which often reveal early vascular strain. C measures lipid transport and cardiovascular exposure and becomes far more actionable when paired with structural context like coronary calcium scoring and echocardiography. D tracks oxygen carrying capacity and iron biology, which is especially relevant when androgen signaling influences red blood cell production. S adds structural and screening context that converts abstract risk into observable reality.

When you track these domains together, you can see patterns that single labs cannot reveal. You can recognize stability, identify early drift, and understand tradeoffs before they become symptoms or complications. This is the purpose of ABCDS™ thinking, and it is central to the Testosteronology® approach to disciplined, system based monitoring.

If you want expert interpretation rather than guessing at individual numbers, the next step is to have your ABCDS™ results reviewed in the full systems context. Members can order labs, enter and track values over time, and request an integrated review through a Certified Testosteronologist®. The goal is not to chase perfection in one marker, but to build steady, defensible progress across the full ABCDS™ system so your health trajectory becomes clearer and more stable over time.

The Definitive Guide To The Testosteronology® ABCDS™ Framework