LDL uptake and its regulation are important therapeutic targets for atherosclerosis and related diseases. Cayman Chemical's LDL Uptake Cell-Based Assay employs a preparation of human LDL conjugated to Dylight? 550 as a fluorescent probe for detection of LDL uptake into cultured cells. A LDL receptor-specific antibody and a Dylight? 488-conjugated secondary antibody are included in the kit for identifying the distribution of LDL receptors. The kit provides a convenient tool for studying LDL uptake and its regulation at the cellular level.