How to Read Your Cholesterol Results: A Cardiologist's Guide

By Dr Nabila Laskar — published September 2026.

Total cholesterol alone does not tell the full story. Dr Nabila Laskar explains what each component of your cholesterol results means and which numbers actually matter.

Cholesterol results are one of the most frequently misunderstood pieces of medical information patients bring to clinic. The conversation almost always starts with total cholesterol, but that number tells only part of the story. Here is what each component actually means and what to focus on.

Total cholesterol: a starting point, not the whole picture

Total cholesterol combines all cholesterol-carrying particles in the blood. A number above 5.0 mmol/L is often flagged as high, but whether it is meaningful depends entirely on what is driving it. High total cholesterol with high HDL and low LDL has a very different clinical implication from the same number driven by high LDL and triglycerides.

LDL: the number that matters most

Low-density lipoprotein (LDL) is the primary driver of atherosclerosis, the process that causes arterial plaque and, ultimately, heart attacks. The higher and longer LDL remains elevated, the more plaque accumulates over decades. For most people without existing heart disease, an LDL below 3.0 mmol/L is the general target. For those at higher cardiovascular risk or with established disease, targets are considerably lower.

HDL: higher is better, up to a point

High-density lipoprotein (HDL) helps remove cholesterol from the circulation. An HDL above 1.0 mmol/L in men and 1.2 mmol/L in women is considered healthy. A low HDL is an independent cardiovascular risk factor, even when total cholesterol looks acceptable.

Triglycerides: the lifestyle marker

Triglycerides reflect dietary fat and carbohydrate intake, alcohol consumption, and metabolic health. Fasting triglycerides above 2.3 mmol/L are associated with increased cardiovascular and metabolic risk. They fall significantly with dietary change, alcohol reduction, and weight loss.

Non-HDL cholesterol: often more useful than LDL alone

Non-HDL cholesterol (total cholesterol minus HDL) captures all the atherogenic particles, not just LDL. It is a better predictor of cardiovascular risk than LDL alone in people with elevated triglycerides or metabolic syndrome, and is increasingly used as the primary treatment target in national guidelines.

Lp(a): the test most standard panels miss

Lipoprotein(a) is an inherited cholesterol-carrying particle not included in a standard lipid panel. Elevated Lp(a) is an independent and potent cardiovascular risk factor that is not meaningfully reduced by statins or lifestyle change. It is particularly relevant for anyone with a strong family history of early heart disease or who has unexpectedly high cardiovascular risk despite apparently normal standard cholesterol levels. I routinely measure Lp(a) in patients at The Cardiology Doctors where clinical suspicion warrants it.

What to actually do with your results

Cholesterol numbers should never be interpreted in isolation. They form one component of an overall cardiovascular risk assessment that also includes blood pressure, family history, smoking history, diabetes status, age, and sex. A cardiovascular risk score such as QRISK3 combines these factors to give a meaningful ten-year risk estimate that should inform whether and how aggressively to treat.

If you have received cholesterol results that concern you, or have been advised to start a statin but want to understand the full picture first, a cardiologist-led CardioMetabolic assessment is the appropriate next step.

Medically reviewed by Dr Nabila Laskar, Consultant Cardiologist, GMC 7040901.