Apolipoprotein B in Serum/Plasma (Mass Concentration)

Why This Test Matters

Apolipoprotein B (ApoB) is a key protein in cholesterol metabolism. It’s found primarily in low-density lipoproteins (LDL), often called 'bad cholesterol,' but also in other particles like intermediate-density lipoproteins (IDL) and very low-density lipoproteins (VLDL). Measuring ApoB can give doctors a clearer picture of your cholesterol profile beyond just LDL cholesterol levels alone.

What It Measures

This test quantifies the total amount of ApoB in your blood, which reflects the number of cholesterol particles rather than just their size. Higher levels may indicate an increased risk of plaque buildup in your arteries.

How It’s Used

Doctors may order this test to evaluate cardiovascular risk, especially in patients with complex lipid profiles or those who don’t meet traditional LDL cholesterol guidelines. It can also help monitor treatment effectiveness for conditions like familial hypercholesterolemia.

What to Expect

A blood sample is drawn from a vein, usually in your arm. The test involves processing serum or plasma (the liquid part of blood after clotting) to measure ApoB levels. Results are typically ready within a few days.