Used to quantitatively measure Sphingosine-1-phosphate (S1P) levels in biological samples such as serum, plasma, and cell culture supernatants. This kit is widely applied in research settings to study the role of S1P in cellular signaling, immune regulation, inflammation, and vascular function. It supports investigations into autoimmune diseases, cancer progression, and neurological disorders where S1P signaling pathways are involved. The assay enables high-throughput analysis with high sensitivity and specificity, making it suitable for both basic research and drug development studies targeting the S1P receptor system.