HDL-C

High-density lipoprotein cholesterol (HDL-C) is the cholesterol carried in HDL particles, which collect cholesterol from peripheral tissues and return it to the liver for clearance. Conventionally treated as the "good cholesterol," its standing has weakened over the last decade: causal evidence for raising HDL-C as a way to lower cardiovascular events has not held up, and very high HDL-C values appear to lose their protective association. The number is still useful as a marker of metabolic health, but it should never be the focal point of a lipid-management strategy.

Optimal range

Range varies by individual.

Test frequency

Annually as part of a standard lipid panel; every three to six months during an active lipid-management intervention or major dietary or weight-loss program.

When to measure

Measure as part of a standard lipid panel at every annual physical from age 30 onward, and earlier if there is family history of premature cardiovascular disease. Bundle with ApoB, lipoprotein(a), and a hemoglobin A1c so that the lipid picture is interpreted in metabolic context. Fasting overnight (12 hours) improves the accuracy of the triglyceride and calculated LDL-C values that accompany the HDL-C.

How to measure

Direct measurement on a standard lipid panel via venous blood draw. Cost is $20–$60 retail; almost always included in any annual physical bloodwork. Advanced lipid panels (NMR LipoProfile, Cardio IQ) report HDL particle number and size in addition to HDL-C and run $100–$250, worth ordering once to confirm that your HDL is functional rather than just numerically high.

Why this biomarker matters

HDL-C correlates inversely with cardiovascular risk in observational data, but Mendelian randomization studies and randomized trials of HDL-raising drugs (CETP inhibitors, niacin) have repeatedly failed to show event reduction. This is the strongest piece of evidence that HDL-C is more a marker of underlying metabolic health than a causal protector. A high HDL-C in the context of high triglycerides, insulin resistance, or elevated ApoB still flags real cardiovascular risk. There is also a U-shaped curve. Very high HDL-C, above roughly 90 mg/dL in men or 100 mg/dL in women, associates with higher, not lower, all-cause mortality in several large cohorts (CANHEART, Copenhagen General Population Study). The proposed mechanisms involve dysfunctional or oxidized HDL particles that lose their reverse-cholesterol-transport capacity. Practically, HDL-C is most useful as a directional indicator: rising HDL-C alongside falling triglycerides and falling waist circumference is a good metabolic-health signal; HDL-C in isolation is not actionable.

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