Alpha-2-Macroglobulin (a2M) BioAssay ELISA Kit (Human) is a sandwich enzyme immunoassay for in vitro quantitative measurement of a2M in human serum, plasma, urine and other biological fluids.Detection Range:0.78 -50ng/mlSensitivity:0.31ng/mlStorage and Stability:Desiccation recommended. The Standard, Detection Reagent A, Detection Reagent B and the 96-well strip plate should be stored at -20°C upon receipt. Store all other reagents at 4°C. Stable for 6 months after receipt of order.