This assay has high sensitivity and excellent specificity for detection of Apelin. No significant cross-reactivity or interference between Apelin and analogues was observed. Sample types: serum, plasma and other biological fluids. Range: 98.77-8000 pg/mL. Sensitivity: 35.3 pg/mL. Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Apelin were tested 20 times on one plate, respectively. Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Apelin were tested on 3 different plates, 8 replicates in each plate.CV (%) = SD/meanX100;Intra-Assay: CV<10%;Inter-Assay: CV<12%. Time: 2 hours