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 carries cholesterol into artery walls. Decades of trials show that lowering LDL reduces heart attacks and strokes roughly in proportion to how much and how long it is lowered. Every major guideline, ESC/EAS in Europe, ACC/AHA in the US, NICE in the UK, sets LDL goals based on your overall risk: the higher your risk, the lower the goal. For very-high-risk patients the ESC goal is below 1.4 mmol/L (55 mg/dL); for low-risk people there is no drug target at all, just lifestyle.

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

The UK, Europe, and the Gulf report in mmol/L; the US reports in mg/dL. Multiply mmol/L by 38.67 to get mg/dL. Mixing the two is the most common self-inflicted error when comparing results from different countries, and it can make a normal result look terrifying or vice versa.

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