Apolipoprotein B (apoB) - this is the main protein component of LDL particles + the precursors, VLDL + IDL. Each of these particles contain one apoB molecule. Measuring Apolipoprotein A1 + Apolipoprotein B helps to estimate the concentration of cholesterol particles. ApoB is one of two most important structural proteins for the cholesterol particles.
This test requires 12 hours of fasting before the test.