The QuantiGlo Human Endothelin-1 Chemiluminescent Immunoassay is a 4.5 hour solid phase ELISA designed to measure human Endothelin-1 levels in cell culture supernates, serum, EDTA plasma, and urine without extraction. It contains synthetic human Endothelin-1 and antibodies raised against the synthetic factor. This immunoassay has been shown to accurately quantitate human Endothelin-1. Results obtained using natural human Endothelin-1 showed dose curves that were parallel to the standard curves obtained using the QuantiGlo kit standards. These results indicate that this kit can be used to determine relative mass values of natural human Endothelin-1. Range: 0.34 - 250 pg/mL. Sensitivity: 0.102 pg/mL. Time: 4.5 hours