Biomarkers & testing
Blood tests, biological-age clocks, VO₂max and DEXA — which measurements change a decision and which only add cost.
Topic overview →Grip strength testing for longevity: a five-second measurement with more mortality evidence than most blood tests
Grip strength, measured with a hand dynamometer, is one of the most consistently replicated predictors of all-cause mortality, cardiovascular death and future disability in adults — and it does the job independent of age, sex and even total muscle mass. A single squeeze test takes under a minute, needs no lab, and its predictive strength in large cohort studies rivals or beats many routine blood markers. The catch is that most of the devices sold for home grip testing are cheap spring-loaded gadgets with no validation against the hydraulic dynamometers the actual research used — the instrument matters as much as the habit.
PharmD-reviewed · Updated
Which home blood pressure monitor is actually accurate? Most on the market have never been validated
Home blood pressure monitoring is guideline-recommended and changes real treatment decisions — it catches white-coat and masked hypertension that a single clinic reading misses, and trials show it improves blood pressure control when paired with a clinician. The problem is the hardware: independent audits have repeatedly found that most upper-arm and wrist monitors sold on general marketplaces have never been through the accuracy testing that would confirm they read correctly, because validation is voluntary and unregulated manufacturers rarely bother. A short, published list of devices that have actually passed a standardized clinical validation protocol exists — check a model against it before trusting the number it gives you.
PharmD-reviewed · Updated
Continuous glucose monitors for people without diabetes: what the evidence actually supports
Over-the-counter continuous glucose monitors (Abbott Lingo, Dexcom Stelo) reached the market through FDA clearance as general wellness devices, not through evidence that wearing one changes health outcomes in people without diabetes — those are different regulatory bars. The technology itself is accurate and real; what's unresolved is whether reacting to normal, expected glucose fluctuations in a metabolically healthy person changes anything that matters. The evidence is much stronger for one specific group: people whose own lab work (HbA1c, fasting insulin) already shows early insulin resistance, where real-time feedback has a genuine behavior-change rationale behind it.
PharmD-reviewed · Updated
What lab tests monitor efforts to extend lifespan?
A lab test genuinely monitors progress toward extending lifespan only if the result can change a decision — a treatment, a habit, a referral — and this ranking applies that standard rather than ranking on panel size or novelty. Blood pressure, checked regularly at home or in clinic, ranks first, since it is the single risk factor with the largest randomised trial evidence for treatable mortality reduction and directly informs treatment decisions. A lipid panel, particularly ApoB or LDL cholesterol, ranks second, with strong trial evidence linking treatment to reduced cardiovascular events, and a result that directly informs whether medication is warranted. HbA1c and fasting glucose rank third, identifying prediabetes and diabetes early enough for intervention to meaningfully change trajectory, with clear treatment thresholds. Kidney and liver function tests rank fourth, since both affect medication safety and dosing and can reveal early, treatable dysfunction. High-sensitivity CRP and other inflammatory markers rank fifth, with real but more modest evidence for informing cardiovascular risk stratification in specific situations, used as an adjunct rather than a primary decision-maker. At the bottom of usefulness for actually monitoring lifespan-extension efforts sit popular 'biological age' tests based on DNA methylation or other novel biomarkers, which can track a number changing over time but have no established treatment threshold and no trial showing that acting on the number changes any outcome — the number moves, and it is genuinely unclear what, if anything, should be done differently as a result.
PharmD-reviewed · Updated
Which blood tests are best for tracking longevity?
The blood tests with the strongest evidence for predicting long-term health are a short, inexpensive panel: ApoB (or non-HDL cholesterol), lipoprotein(a) once in a lifetime, HbA1c with fasting glucose and insulin, high-sensitivity CRP, a full blood count with ferritin, kidney and liver function, and thyroid. Each is tied to hard outcomes in large cohorts and, crucially, each changes a decision. Epigenetic-age tests and most 'longevity panels' add cost without adding a decision.
PharmD-reviewed · Updated
Best longevity blood tests and biomarkers to monitor.
The biomarkers worth monitoring for longevity are the ones that predict hard outcomes and respond to something you can change: ApoB (target under roughly 80 mg/dL for most adults, lower with higher risk), lipoprotein(a) once, HbA1c (under 5.7%) with fasting glucose and insulin, hs-CRP (under 1 mg/L, repeated), blood pressure (under 120/80 where tolerated), plus organ function, ferritin, thyroid and vitamin D annually. Retest the modifiable ones every six to twelve months or three months after a deliberate change. Read each as a trend across draws; a single result outside range is a prompt to repeat, not to act.
PharmD-reviewed · Updated
VO2 max testing for longevity: what it measures, and what the evidence actually shows
VO2 max — the maximum rate your body can use oxygen during maximal exertion — is one of the most consistently strong predictors of all-cause mortality in the medical literature, ahead of smoking, diabetes and hypertension in some large cohorts. A lab test with gas-exchange analysis is the accurate way to measure it; smartwatch estimates are rough and can be off by a meaningful margin. The test doesn't treat anything — its value is establishing a real baseline and tracking whether training is actually working.
PharmD-reviewed · Updated
Biological age tests: what they measure and what they miss
Epigenetic clocks measure chemical marks on DNA that track ageing at a population level. They are genuine science, and they are far less precise for one individual than the single confident number on the report implies. Read a result as a trend line across repeated tests, never as a verdict from one draw.
PharmD-reviewed · Updated
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