Total Cholesterol — Normal Range & Interpretation

Clinical Context

Total cholesterol measures the sum of LDL, HDL, and VLDL-associated cholesterol circulating in the blood. It serves as a screening marker for atherosclerotic cardiovascular disease risk and anchors the lipid panel used to guide statin therapy decisions, lifestyle counseling, and cardiovascular risk stratification in adults.

Elevations stem from genetic conditions like familial hypercholesterolemia, diets high in saturated and trans fats, obesity, metabolic syndrome, type 2 diabetes, hypothyroidism, nephrotic syndrome, cholestatic liver disease, and medications such as thiazides, corticosteroids, and protease inhibitors. Depressed values point toward malnutrition, malabsorption, hyperthyroidism, advanced liver disease, or severe acute illness, and they warrant evaluation when unexpected in an otherwise healthy patient.

Board-style questions on total cholesterol pair the 200 to 239 mg/dL borderline and 240 mg/dL or higher as high, order a fasting lipid panel for further fractionation, and recognize that treatment decisions hinge on LDL and ASCVD risk rather than total cholesterol alone. Questions frequently pair an elevated total cholesterol with lifestyle counseling, statin initiation thresholds, secondary causes like untreated hypothyroidism, and screening intervals for adults beginning at age 20 with reassessment every four to six years when risk is low.

Practice Questions

Related Labs

• LDL — mg/dL
• HDL — mg/dL
• Triglycerides — mg/dL

Sources

• MedlinePlus