The Ansh Labs' Follistatin ELISA kit is a quantitative three-step sandwich immunoassay for the measurement of Total Follistatin (288, 300, 315) in human serum and other biological fluids. Analytical measureable range of 0.625 - 20 ng/mL. Total 3 hour incubation at room temperature. Long shelf life of 24 months. For Research Use Only within the United States. Ansh Labs, located just south of Houston Texas, is an FDA registered manufacturer of diagnostic test kits, antibodies, antigens, and proteins.