Getting an accurate cholesterol test

A standard lipid profile measures total cholesterol, HDL cholesterol and triglycerides, while LDL cholesterol may be measured or calculated. One result is a snapshot, so an unexpected value may need confirmation.

Recent food intake can particularly influence triglycerides and may affect a calculated LDL value. Acute illness, pregnancy, alcohol use, weight change and some medicines can also alter the profile.

Fasting is not required for every cholesterol check. Your clinician or laboratory may request it when triglycerides need closer assessment or when a previous sample was difficult to interpret. Follow the instructions supplied for your specific test.

Tell the clinician about current medicines, supplements, recent illness and whether you followed any fasting directions. Do not stop prescribed medicine or make an extreme diet change solely to influence the test.

If the result is surprising or does not fit earlier readings, ask whether it should be repeated when you are well and under comparable conditions. Cardiovascular decisions also consider blood pressure, diabetes, smoking, family history and existing heart or blood-vessel disease.

High cholesterol itself usually causes no immediate symptoms, so routine follow-up is appropriate for most abnormal results. Seek emergency care for chest pressure, severe shortness of breath, sudden weakness on one side, facial drooping or new difficulty speaking; do not wait for another blood test.

Arrange prompt review when a markedly unexpected result accompanies a strong family history of early heart disease or visible fatty deposits around tendons or the eyes, because the clinician may assess for an inherited lipid disorder.

Ask whether your LDL was calculated or directly measured, whether fasting would change the next test, and how the full profile influences your personal prevention or treatment plan.