Total cholesterol is a crude summary. It can look 'normal' in someone with a dangerous lipid profile and falsely elevated in a metabolically healthy person. We de-emphasize it in favor of Apo B, LDL-P, and the triglyceride/HDL ratio — markers that actually track your risk.

HDL runs reverse cholesterol transport, pulling cholesterol out of your artery walls and back to the liver. Higher is generally protective — but very high HDL (> 90) can signal dysfunctional particles. The triglyceride-to-HDL ratio is the piece we watch most closely, because it's a powerful surrogate for insulin resistance.

Triglycerides are a direct read on how your body handles carbohydrates and insulin. Elevated levels flag insulin resistance and metabolic syndrome, and drive residual cardiovascular risk. We target under 80 mg/dL for genuine metabolic health.

LDL cholesterol measures the cholesterol carried inside LDL particles — but two people with identical LDL-C can carry very different particle counts. It's useful, but it's only part of the story. We always pair it with Apo B and LDL-P for an accurate picture of risk.

This ratio captures the balance between atherogenic and protective cholesterol in a single number. A ratio under 3.0 reflects a favorable lipid environment; rising values point toward growing cardiovascular risk even when individual numbers look acceptable.

Non-HDL captures every atherogenic particle — LDL, VLDL, IDL, and Lp(a) — in one number, making it a better risk marker than LDL alone. It's especially useful when triglycerides are elevated. Longevity medicine drives it well below the conventional threshold.

One of the best bedside surrogates for insulin resistance and small, dense LDL. A ratio under 1.5 suggests good insulin sensitivity and a favorable, buoyant LDL pattern; a rising ratio is often the earliest sign of metabolic trouble.

A direct count of the LDL particles in your blood. More particles means more chances for LDL to enter the arterial wall and start plaque — which is why LDL-P outperforms standard LDL-C for predicting events. It's essential when particle number and cholesterol content disagree.

Small, dense LDL particles are the most dangerous kind — they slip into artery walls more easily, oxidize readily, and linger in circulation. A high small-LDL-P is a hallmark of insulin resistance. Diet, exercise, and metabolic work can drive this number down substantially.

Not all LDL is equal. Large, buoyant particles (Pattern A) are far less atherogenic than small, dense ones (Pattern B). LDL size tells us the quality of your particles, not just the quantity — and it shifts favorably with metabolic optimization.

The count of HDL particles available to do reverse cholesterol transport. A higher HDL-P generally reflects a more protective, functional HDL pool than HDL cholesterol alone can show.

Large HDL particles are the most efficient at extracting cholesterol from artery walls. A healthy proportion of large HDL is associated with genuinely protective HDL function, rather than the falsely reassuring 'high HDL' that can accompany metabolic dysfunction.

Larger, more mature HDL particles are better at reverse cholesterol transport. HDL size adds nuance to your HDL story — good size supports the interpretation that your HDL is doing its protective job.

Large VLDL particles are triglyceride-rich and strongly linked to insulin resistance and metabolic syndrome. Elevated large VLDL-P is an early signal that your body is struggling to clear dietary fat and carbohydrate efficiently.

VLDL size reflects the triglyceride load your liver is packaging into particles. Larger VLDL tends to accompany elevated triglycerides and insulin resistance, so a smaller size within range is generally more favorable metabolically.

Apo B is the single best predictor of cardiovascular risk — better than LDL cholesterol alone. Every atherogenic particle (LDL, VLDL, IDL, Lp(a)) carries exactly one Apo B, so this is a direct count of the particles that can drive plaque. We target 60–80 mg/dL to minimize lifetime exposure.

A genetically determined lipoprotein that sharply amplifies heart and aortic-valve disease risk. It carries both cholesterol and a pro-clotting protein, and it can explain heart disease in people with otherwise 'perfect' cholesterol. It rarely changes, so it's a once-in-a-lifetime test — and knowing it lets us push every modifiable risk factor harder.

This enzyme is produced by macrophages inside arterial plaque, so an elevated level signals active, unstable, rupture-prone plaque — the kind that causes heart attacks and strokes. Unlike hs-CRP (whole-body inflammation), Lp-PLA2 is specific to the artery wall, making it a precision marker of vascular disease activity.

The gold-standard marker for systemic inflammation — a driver of cardiovascular disease, metabolic syndrome, neurodegeneration, and accelerated aging. Even 'normal' values of 1.0–3.0 double cardiovascular risk versus under 0.5. Chronic low-grade inflammation ('inflammaging') is a core hallmark of biological aging, so we push this below 1.0.

An amino acid that, when elevated, damages blood-vessel linings, promotes clotting, and accelerates atherosclerosis — and it's independently linked to cognitive decline and osteoporosis. It's a direct readout of how well your methylation pathways are running. We treat anything above 8 as room for improvement.

The most sensitive marker for functional B12 deficiency — more reliable than serum B12 alone. When your cells can't access enough B12, MMA accumulates. An elevated MMA means your tissues are B12-deficient even if your serum B12 reads 'normal.'

Essential for nerve function, red blood cell production, DNA synthesis, and methylation. Conventional medicine calls anything over 200 'normal,' but neurological symptoms and cognitive decline can appear below 500. Deficiency is a silent epidemic — especially over 50, in vegetarians, and on metformin or acid-reducers — so we target the upper range.

A critical methyl donor for DNA synthesis and repair that works hand-in-hand with B12 to clear homocysteine. Low folate is tied to elevated homocysteine, cardiovascular disease, depression, and cognitive decline. People with MTHFR variants often need the active form (5-MTHF) rather than synthetic folic acid.

Foundational for muscle, bone, libido, energy, mood, and cognition in both sexes. Conventional cutoffs call a symptomatic 35-year-old at 280 ng/dL 'normal.' We target the upper half of the range to support vitality, body composition, and long-term disease prevention — and in women, to restore drive and muscle that decline hormonally.

Only 1–3% of testosterone circulates unbound — and this free fraction is what's actually active at your tissue receptors. You can have 'normal' total testosterone but low free T from high SHBG, and feel every symptom of low T. This is the most clinically relevant androgen marker.

SHBG binds testosterone and estradiol, making them biologically inactive. High SHBG lowers free testosterone even when total looks fine; low SHBG (common with insulin resistance) frees up excess estradiol. It's also a window into metabolic health — inversely correlated with insulin resistance and an independent diabetes-risk predictor.

The most potent, biologically active estrogen — protecting cardiovascular health, bone, brain, skin, and mood in women, and essential for bone, brain, and libido in men. The ultrasensitive assay is accurate at the low levels that matter in menopause and in men. Optimizing estradiol profoundly shapes healthspan; in men on TRT, monitoring it guides whether aromatase management is needed.

An adrenal precursor hormone that converts into both estrogen and testosterone, and one of the most abundant hormones in the body. It declines steadily with age — by 70, levels are often 10–20% of peak. Optimal DHEA-S supports immune function, mood, energy, bone health, and body composition, and it's a marker of adrenal reserve.

FSH rises as ovarian reserve declines, so an elevated level in perimenopause confirms the ovaries are struggling to make enough estrogen. Read alongside estradiol, it tells us exactly where a woman is in her transition and helps time and dose hormone therapy.

LH triggers ovulation and progesterone production. An elevated LH-to-FSH ratio can point to PCOS, while rising LH alongside FSH confirms menopausal transition. In men, LH helps distinguish whether low testosterone originates in the testes or the pituitary.

Elevated prolactin can suppress sex hormones, blunt libido, disrupt cycles, and — when significantly high — signal a pituitary adenoma. It's an important screen when testosterone or estrogen is low without an obvious cause, and it rounds out the reproductive-hormone picture.

The 'mother hormone' — the precursor from which cortisol, DHEA, progesterone, testosterone, and estrogen are all made. Low pregnenolone can indicate an upstream deficiency affecting the entire hormonal cascade. Optimizing it supports brain function, memory, mood, and overall hormonal balance.

A baseline and monitoring marker for prostate health — essential before and during testosterone therapy. It isn't cancer-specific (it also rises with prostatitis, BPH, even exercise), so the value is in the trend over time. We establish a baseline before TRT and track it regularly for safety.

The pituitary's signal to the thyroid. Conventional medicine won't flag dysfunction until TSH tops 4.5, but a TSH above 2.0–2.5 often already means suboptimal thyroid function — the fatigue, weight gain, brain fog, hair loss, and low mood that get dismissed as 'normal aging.'

The storage form of thyroid hormone, which must be converted to Free T3 to work. Checked alongside TSH, it shows whether the gland is producing enough hormone. Low Free T4 with a 'normal' TSH can reveal central hypothyroidism or early dysfunction.

The active thyroid hormone — what actually drives metabolism, energy, body temperature, and cognition. Many people have adequate T4 but poor conversion to T3 from stress, inflammation, or nutrient gaps (selenium, zinc, iron). Free T3 is the most clinically relevant thyroid marker and often the missing piece for people who 'look normal on paper' but feel terrible.

IGF-1 is the stable downstream readout of growth hormone, governing tissue repair, muscle maintenance, and body composition. Low IGF-1 accompanies poor recovery and sarcopenia, while very high levels raise longevity concerns — so the goal is a balanced position within your age-adjusted range, not simply 'as high as possible.'

The Z-score places your IGF-1 against age- and sex-matched norms, which is essential because raw IGF-1 changes dramatically across the lifespan. A Z-score near 0 to +1 reflects a healthy growth-hormone axis — enough for repair and vitality without pushing into the range associated with accelerated aging.

The most basic metabolic marker. Conventional ranges run to 99 before flagging 'prediabetes,' but metabolic dysfunction and rising cardiovascular risk begin above 85. Tighter targets let us catch insulin resistance years before conventional medicine would name a problem.

Reflects your average blood glucose over the past 2–3 months. Conventional medicine calls 5.6% perfectly fine, but cardiovascular risk starts climbing above 5.0%. Keeping A1c under 5.3% means excellent glucose control and minimal glycation — the process where excess sugar damages proteins and accelerates aging.

One of the most important — and most underused — markers in medicine. Elevated fasting insulin precedes type 2 diabetes by 10–20 years and drives weight gain, inflammation, PCOS, fatty liver, and cardiovascular disease. We treat anything above 7–8 as an early red flag for metabolic dysfunction.

Calculated from fasting glucose and fasting insulin, HOMA-IR quantifies insulin resistance in a single number. It's the most practical way to catch metabolic dysfunction early — often years before HbA1c or fasting glucose drift out of range. A value above 1.0 suggests insulin resistance is already developing while everything else still looks 'normal.'

Reflects kidney function and protein metabolism. High BUN can mean dehydration, heavy protein intake, or kidney stress; low BUN can reflect poor protein intake or liver disease. We read it alongside creatinine and eGFR for the full renal picture.

A byproduct of muscle metabolism filtered by the kidneys. It's the primary input to eGFR, and it's read in context — a muscular, active person naturally runs a touch higher. Stable values within the functional range reflect healthy filtration and adequate muscle mass.

An estimate of how well your kidneys filter blood. A declining eGFR is one of the earliest signs of kidney aging. We track the trend over time — even a 'normal' eGFR that's dropping year over year warrants attention long before it crosses a diagnostic line.

Central to fluid balance, nerve conduction, and blood pressure regulation. Values at the edges of range can signal hydration issues, adrenal or kidney dysfunction, or medication effects. Mid-range reflects healthy fluid and electrolyte control.

Essential for heart rhythm, muscle contraction, and nerve signaling. Low potassium raises cardiovascular risk and is common in people on diuretics or with poor dietary intake. We aim for the upper-middle of the range, where cardiac and muscle function are most stable.

Works with sodium and bicarbonate to maintain fluid balance and acid-base status. Shifts in chloride can reveal hydration problems, kidney issues, or acid-base disturbances that aren't obvious from other markers alone.

A read on your acid-base balance and the buffering capacity of your blood. Low values can indicate metabolic acidosis (sometimes tied to kidney function or diet); high values can reflect the opposite. Mid-range reflects a well-buffered, balanced system.

Tightly regulated for bone health, nerve signaling, muscle function, and clotting. Persistently high calcium can point to parathyroid or vitamin D issues; low calcium to malabsorption or deficiency. Because it's kept in a narrow band, small deviations are meaningful.

The sum of albumin and globulin — a snapshot of nutritional status, liver synthetic function, and immune activity. It's most useful read together with its two components and the A/G ratio, which reveal what's driving any change.

A powerful predictor of overall health and longevity. Low albumin — even within 'normal' range — is tied to higher mortality, poor wound healing, muscle wasting, and chronic inflammation. In longevity research, higher albumin consistently tracks with a longer, healthier life.

This protein fraction includes antibodies and transport proteins. Elevated globulin can signal chronic inflammation, infection, or immune activation; low globulin can reflect immune deficiency. It adds context to total protein and the A/G ratio.

The balance between albumin and globulin often reveals more than either number alone. A low A/G ratio can flag chronic inflammation or immune activation, while a healthy ratio reflects good nutrition and a quiet immune system.

A byproduct of red blood cell breakdown processed by the liver — and, at slightly elevated levels (as in Gilbert's syndrome), a potent antioxidant that's actually protective against cardiovascular risk. Significantly high bilirubin, however, can indicate liver or hemolytic conditions.

An enzyme from liver, bone, and bile ducts. High ALP can point to bile-flow obstruction or bone turnover; very low ALP can reflect zinc deficiency or low bone activity. Read with the other liver enzymes, it helps localize where a signal is coming from.

A liver (and muscle) enzyme that rises with cellular stress or damage. Even 'normal-range' elevations of 30–40 are associated with fatty liver and insulin resistance. We target under 25, the level that reflects a genuinely healthy, non-inflamed liver.

The most liver-specific of the standard enzymes. 'Normal' elevations in the 35–55 range are strongly linked to non-alcoholic fatty liver disease and metabolic dysfunction. Longevity medicine targets under 25 — a marker of a truly healthy liver.

A sensitive marker of liver stress, bile-flow issues, alcohol intake, and oxidative stress — and it's independently associated with cardiovascular risk and mortality. GGT often rises before other liver enzymes, so a low value is reassuring evidence of a well-functioning, unstressed liver.

Your immune system's front line. High WBC can flag infection or inflammation; low WBC can reflect immune suppression or nutrient deficiency. A stable mid-range count, and a healthy neutrophil-to-lymphocyte ratio, point to a balanced, well-regulated immune system.

The cells that carry oxygen throughout your body. Low RBC signals anemia and fatigue; high RBC can accompany dehydration or testosterone therapy. We watch it closely alongside hematocrit, especially for anyone on TRT.

The oxygen-carrying protein inside red blood cells. Low hemoglobin means anemia — fatigue, breathlessness, poor exercise tolerance — often from iron, B12, or folate gaps. It's a cornerstone of understanding your energy and endurance.

The percentage of your blood made up of red cells. Testosterone therapy can raise red-cell production, and it's important to monitor — above 54%, hematocrit can affect blood pressure and other health parameters, so this is one of the key safety markers we track on TRT.

The average size of your red blood cells — a key clue to the cause of anemia. Large cells (high MCV) point toward B12 or folate deficiency; small cells (low MCV) toward iron deficiency. It turns a simple count into a diagnostic roadmap.

The average amount of hemoglobin per red blood cell. Together with MCV, it helps classify anemia and distinguish nutrient-deficiency patterns from other causes.

The concentration of hemoglobin within each red cell. Low MCHC accompanies iron-deficiency anemia; abnormal values can also flag certain inherited red-cell conditions. It adds precision to the anemia workup.

A measure of how uniform your red blood cells are in size. Beyond spotting mixed anemias, an elevated RDW is a surprisingly strong independent predictor of cardiovascular risk and all-cause mortality — which is why we keep an eye on it even when hemoglobin is normal.

The cells responsible for clotting. High platelets can accompany inflammation or iron deficiency; low platelets can reflect bone marrow, liver, or immune issues. Trends over time can quietly signal chronic inflammation.

The average size of your platelets, which reflects how actively your marrow is producing them. Larger, younger platelets (high MPV) are more reactive and have been linked to cardiovascular risk, adding nuance to the platelet picture.

A hormone, not really a vitamin — it regulates over 1,000 genes involved in immunity, bone health, mood, cancer prevention, and cardiovascular protection. Conventional medicine calls 30 'sufficient,' but benefits continue to 50–80. Deficiency raises the risk of autoimmune disease, cancer, depression, osteoporosis, and all-cause mortality.

The iron currently circulating in your blood. It fluctuates day to day, so it's interpreted alongside TIBC, saturation, and ferritin rather than alone. Together these paint a complete picture of whether you have enough iron to build red cells and fuel energy.

A measure of how much transport protein (transferrin) is available to carry iron. TIBC rises when the body is iron-deficient and hunting for more, and falls with inflammation or iron overload — making it a key piece of the iron-studies puzzle.

The percentage of your iron-transport capacity that's actually filled — one of the earliest and most reliable signs of iron status. Low saturation flags developing deficiency before hemoglobin drops; high saturation can point toward iron overload or hemochromatosis.

Your iron storage marker — and an inflammation marker too. Low ferritin causes fatigue, hair loss, poor exercise tolerance, and brain fog even while hemoglobin still looks 'normal.' High ferritin can mean iron overload, inflammation, or metabolic dysfunction. The goal is the balanced 'Goldilocks zone.'