What Blood Test to Check Cholesterol

The primary blood test to check cholesterol is the lipid panel (also called a lipid profile or complete cholesterol test). This single blood draw measures total cholesterol, LDL (bad) cholesterol, HDL (good) cholesterol, and triglycerides. Today, updated clinical guidelines continue to recommend the lipid panel as the gold standard for assessing cardiovascular risk in adults aged 20 and older, with testing every 4–6 years for those at low risk and more frequently for individuals with diabetes, hypertension, or a family history of heart disease.

Understanding the Lipid Panel

A lipid panel is a routine blood test ordered by your healthcare provider. It requires a simple venipuncture, and most labs recommend fasting for 9–12 hours beforehand to ensure the most accurate triglyceride measurement. However, non-fasting lipid panels are now widely accepted for initial screening due to convenience, though fasting is still preferred for precise triglyceride levels above 400 mg/dL.

What Each Component Measures

• Total cholesterol: The sum of all cholesterol in your blood, including LDL, HDL, and VLDL. Optimal level: below 200 mg/dL.
• LDL cholesterol ("bad"): Carries cholesterol to arteries; high levels cause plaque buildup. Optimal: below 100 mg/dL; near-optimal: 100–129 mg/dL.
• HDL cholesterol ("good"): Helps remove excess cholesterol from the bloodstream. Optimal: 60 mg/dL or higher; low: below 40 mg/dL for men, below 50 mg/dL for women.
• Triglycerides: A type of fat in the blood; high levels are linked to diabetes and metabolic syndrome. Optimal: below 150 mg/dL.

Advanced Cholesterol Tests today

For individuals with borderline results or a strong family history of heart disease, advanced lipoprotein testing may be ordered. These include the apolipoprotein B (apoB) test, which counts the number of atherogenic particles, and the lipoprotein(a) [Lp(a)] test, a genetic marker for elevated cardiovascular risk. The American Heart Association guidelines now endorse Lp(a) testing once in a lifetime for all adults, as levels are largely genetically determined and not significantly altered by lifestyle.

When to Consider Advanced Testing

Your doctor may recommend advanced lipid testing if you have: a personal or family history of premature heart disease (before age 55 in men, 65 in women), a previous LDL level above 190 mg/dL, or diabetes with additional risk factors. These tests provide deeper insight beyond the standard lipid panel and can guide more aggressive prevention strategies.

How to Prepare for Your Cholesterol Blood Test

Proper preparation ensures reliable results. Follow these steps before your blood draw:

Interpreting Your Results

Your lipid panel results are reported in milligrams per deciliter (mg/dL). Today, most labs use the following general ranges: total cholesterol under 200 mg/dL is desirable; 200–239 mg/dL is borderline high; 240 mg/dL and above is high. LDL below 100 mg/dL is optimal, while 130–159 mg/dL is borderline high. HDL below 40 mg/dL is a major risk factor. Triglycerides under 150 mg/dL are normal, 150–199 mg/dL are borderline high, and 200–499 mg/dL are high.

The Importance of Regular Screening

Routine cholesterol screening is a cornerstone of preventive cardiology. With heart disease remaining the leading cause of death in the United States, early detection through a simple blood test can prompt lifestyle changes or medication that reduce risk. The U.S. Preventive Services Task Force continues to recommend screening starting at age 20 for those with risk factors, and at age 40 for all adults. For optimal heart health, pair your lipid panel with blood pressure and glucose checks.

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