HDL (“good”) cholesterol: particles that help reverse-transport cholesterol.
What it is
HDL cholesterol in mmol/L. Higher HDL is generally favourable in population studies, but very high HDL is not a guarantee of protection.
HDL particles pick up cholesterol from tissues and return it toward the liver (reverse transport). HDL cholesterol concentration in mmol/L is the routine report, not a particle count or function assay.
Why it matters
CVD risk still depends on the full lipid profile, non-HDL/LDL, and clinical factors. Low HDL associates with insulin resistance, smoking, and inactivity: lifestyle context matters.
This guide is educational only and cannot diagnose you. Discuss results, especially anything outside your laboratory’s reference interval, or that does not match how you feel, with a GP or other appropriately qualified clinician.
Higher HDL associates with lower CVD risk in populations, but raising HDL with medicines has not consistently reduced events. Very high HDL is not a free pass if LDL/non-HDL and risk factors are adverse. Low HDL often travels with insulin resistance, smoking, and inactivity.
This guide is educational only and cannot diagnose you. Discuss results, especially anything outside your laboratory’s reference interval, or that does not match how you feel, with a GP or other appropriately qualified clinician.
How it affects the body
HDL particles participate in reverse cholesterol transport and have complex inflammatory interactions: biology is richer than the “good cholesterol” slogan.
HDL biology includes cholesterol efflux, antioxidant enzymes, and inflammatory signalling: more complex than “good cholesterol”. Blood HDL-C is a useful risk marker, not a complete measure of HDL function.
For athletes
Aerobic training often raises HDL modestly. Do not skip LDL/non-HDL interpretation because HDL looks reassuring.
Aerobic training and reducing smoking/refined carbs often improve HDL modestly. Keep watching non-HDL/LDL; a high HDL does not cancel a high atherogenic burden.
