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Total cholesterol

All the cholesterol carried in the blood added together — LDL, HDL and the cholesterol inside triglyceride-rich particles. On its own it is a blunt instrument, because a high figure driven by high HDL means something very different from the same figure driven by high LDL. It is reported mainly because it is cheap and because ratios are built from it.

General information only — not a diagnosis, not treatment and not a substitute for your doctor. Reference ranges differ between laboratories, so the range printed on your own report is the one that counts, and only a clinician who knows your history can say what a result means for you. Never start, stop or change a medicine or supplement based on this page.

Usual adult reference range

The ranges below are typical adult reference intervals. Your own laboratory sets its own, printed next to your result, and that is the one to compare against.

Source: Commonly quoted desirable levels from cardiovascular prevention guidance; treatment targets are individual and depend on total risk, not on this figure alone. · checked 2026-09-02

What a high result generally indicates

A raised total cholesterol is a prompt to look at the breakdown rather than a finding in itself. What matters clinically is LDL (and non-HDL) cholesterol together with your overall cardiovascular risk — age, blood pressure, smoking, diabetes, family history. Risk is assessed with a chart or calculator, not with one lipid number.

What a low result generally indicates

Low total cholesterol is not usually treated as a problem. When it is unexpectedly low it can accompany an overactive thyroid, liver disease, malabsorption or malnutrition, so it is interpreted alongside the rest of the panel.

These are general patterns, not a diagnosis. Many things cause a high or low result, and the same figure means different things in different people. What yours means is a question for the doctor who ordered the test.

What affects this result

• Saturated fat intake raises LDL and therefore total cholesterol.
• Body weight, alcohol and physical activity all shift the panel.
• Untreated hypothyroidism raises it; treating the thyroid lowers it again.
• Pregnancy raises lipids substantially, so testing is usually deferred.
• Acute illness lowers lipids for weeks afterwards.
• Strong genetic causes exist — familial hypercholesterolaemia runs in families.

Before the test

Non-fasting samples are acceptable for most lipid testing; fasting is sometimes requested when triglycerides are high.

Any preparation instruction that comes with your test slip overrides this general note — follow the one your clinician or laboratory gave you.

The one thing to take from this page

The range above is a typical interval for orientation. Your own laboratory's range, printed beside your result, is the one that applies to you — and a result is only meaningful alongside your symptoms, your history, your medicines and your other tests. That reading is a clinician's job. This page cannot diagnose anything, cannot tell you to change a medicine or a supplement, and is not a substitute for the person who ordered your test.

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