How to read your cholesterol panel: LDL, HDL, non-HDL and triglycerides explained

A standard lipid panel has four or five rows and most people only look at one of them. Here is what each row actually tells you, and which ones the major guidelines treat as treatment targets.

LDL cholesterol: the main target

LDL contributes to cholesterol deposition in artery walls. Lowering LDL reduces cardiovascular events, with the expected benefit depending on baseline risk and treatment. Guidelines use overall risk and specific conditions to guide treatment. A low short-term risk score does not rule out medication, particularly with severe LDL elevation or familial hypercholesterolemia. Ask which guideline and personal treatment goal apply to you.

HDL cholesterol: context, not a target

HDL was once called the good cholesterol and people were told to raise it. Trials of drugs that raised HDL failed to reduce events, so no current guideline treats HDL as a target. It still matters inside risk equations: a low HDL nudges your calculated risk upward.

Non-HDL cholesterol: the underrated row

Non-HDL is simply total cholesterol minus HDL. It captures every atherogenic particle at once, LDL, VLDL, remnants, Lp(a), and it needs no fasting sample. SCORE2 is built on it, and NICE uses it as a secondary target. If your triglycerides are high, non-HDL is often more informative than LDL.

Triglycerides

Fasting triglycerides above about 1.7 mmol/L (150 mg/dL) flag metabolic risk, and very high levels, above roughly 10 mmol/L, raise pancreatitis risk and need prompt medical review. Moderate elevations usually improve with the same measures that improve everything else: less alcohol, fewer refined carbohydrates, more activity, weight loss if relevant.

Units trip people up

Laboratories may use mmol/L or mg/dL. For total, LDL, HDL and non-HDL cholesterol, multiply mmol/L by 38.67 to obtain mg/dL. Triglycerides use a different factor: multiply by 88.57. Divide by the same factor to go the other way. Preserve the original test name and unit. Neither factor applies to Lp(a).

Evidence: AHRQ/NCBI Bookshelf: lipid conversion factors

Treat LDL by your overall risk, read non-HDL when triglycerides are high, and always check which units the laboratory used.