# ApoB **Apolipoprotein B (ApoB)** is a protein present on the surface of all lipoproteins that can potentially cause atherosclerosis by clogging arteries. These lipoproteins, which include HDL and LDL, are responsible for transporting cholesterol throughout the body. The ApoB test directly measures the quantity of these particles in the blood, offering a more precise assessment of the risk they pose. Maintaining ApoB at optimal levels is crucial for ensuring efficient cholesterol transport and removal, which supports cardiovascular health and promotes longevity. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.beoptimal.ca/biomarker-panels/focused-longevity-panel/apob.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.