The APOA1 antibody is a crucial tool in biomedical research and diagnostics, targeting apolipoprotein A1 (APOA1), the primary protein component of high-density lipoprotein (HDL). APOA1 plays a vital role in lipid metabolism, facilitating cholesterol efflux from peripheral tissues to the liver—a process critical for reducing cardiovascular disease risk. It also exhibits anti-inflammatory, antioxidant, and anti-apoptotic properties, contributing to its atheroprotective effects. APOA1 antibodies, both monoclonal and polyclonal, are widely used to detect and quantify APOA1 in biological samples via techniques like ELISA, Western blot, and immunohistochemistry. In clinical settings, these antibodies aid in assessing HDL functionality and diagnosing conditions linked to APOA1 dysregulation, such as atherosclerosis, metabolic syndrome, and rare genetic disorders like Tangier disease. Research applications include studying APOA1's role in diseases beyond cardiovascular health, including sepsis, neurodegenerative disorders, and cancer. Recent studies also explore APOA1 mimetic peptides as therapeutic agents, with antibodies serving as validation tools. However, variability in antibody specificity and standardization across assays remains a challenge, emphasizing the need for rigorously validated reagents. Overall, APOA1 antibodies are indispensable for understanding lipid metabolism and developing targeted therapies.