apolipoprotein B
Pronunciation: ap-oh-LIP-oh-proh-teen
A protein component of atherogenic lipoproteins that serves as an alternative lipid marker for cardiovascular risk assessment, particularly when standard lipid panels may be misleading.
Full Definition
Apolipoprotein B (apoB) is the primary protein component of low-density lipoprotein (LDL), very low-density lipoprotein (VLDL), and intermediate-density lipoprotein particles. Each atherogenic lipoprotein particle contains exactly one apoB molecule, making it a direct measure of the number of potentially harmful particles. ApoB levels may be particularly useful in patients with diabetes, metabolic syndrome, or hypertriglyceridemia where calculated LDL cholesterol may underestimate cardiovascular risk. Target levels are typically <90 mg/dL for high-risk patients and <80 mg/dL for very high-risk patients.
Usage
Usage note: Commonly abbreviated as apoB; ensure consistent spacing and capitalization throughout documents.
In Context
- "The patient's apolipoprotein B level of 95 mg/dL suggests residual cardiovascular risk despite achieving LDL cholesterol targets." — lipid specialist consultation
- "Consider measuring apolipoprotein B in patients with discordant lipid profiles or metabolic syndrome." — clinical practice recommendation