Comprehensive Diagnostics — A Practical Guide to Men's Health Labs

ApoB (apolipoprotein B) is the protein on each atherogenic particle (LDL, VLDL, IDL, Lp(a)). It counts the actual number of cholesterol-carrying particles entering your arteries, which is what drives plaque — not the total cholesterol they're carrying. ApoB is more accurate than LDL-C for cardiovascular risk, especially in patients with metabolic syndrome, diabetes, or discordance between LDL particle number and cholesterol concentration. Many cardiologists now consider ApoB the better target. Costs $30–$80 to add to a standard lipid panel.

Lp(a) (lipoprotein little-a) is a genetic variant of LDL that's an independent cardiovascular risk factor — elevated levels increase heart attack and stroke risk regardless of standard cholesterol numbers. About 1 in 5 people carry elevated Lp(a). Test once in your lifetime — it doesn't change much. If elevated, more aggressive management of other risk factors becomes important. PCSK9 inhibitors lower Lp(a) modestly; specific Lp(a)-targeting drugs are in trials. Almost no insurance covers it routinely; cash-pay is typically $20–$50.

For healthy men 35–50 with no specific concerns: every 1–2 years for a comprehensive panel makes sense. With chronic conditions, on medication, or actively optimizing: every 6–12 months. Starting a new protocol (TRT, GLP-1, peptides): baseline + 6–12 weeks after initiation, then twice yearly. The pattern matters more than the snapshot — your own numbers trending over time tell more than a single reading vs population norms.

Worthwhile for some, not others. CGM (Dexcom Stelo, Levels, Abbott Lingo, Nutrisense) reveals your individual glucose response to specific foods, sleep impact on glucose, exercise effects, and stress-driven spikes. For metabolically healthy people, the insights tend to be: refined carbs spike more than expected, late-night meals impair morning numbers, and exercise reduces spikes. For pre-diabetics or those with strong family history of diabetes, CGM is increasingly clinically useful. Costs $80–$200/month, generally not insurance-covered without diagnosis.

Function Health is a subscription model: $499/year for 100+ markers twice annually with clinician review. Traditional cash-pay comprehensive panel through a clinic: $300–$800 one-time, similar marker depth, with personalized interpretation. Insurance-covered annual physical: 15–30 markers, no extras unless symptoms documented. Function's value is the comprehensive default; the trade-off is mass-produced interpretation vs personalized clinical context. For a baseline at one point in time, traditional probably wins on depth-of-care; for ongoing longitudinal tracking, Function is convenient and reasonably priced.