The Ansh Labs' IGF-I ELISA kit is a quantitative one-step sandwich immunoassay. The direct detection method eliminates potential altering of sample matrix from size-exclusion chromatography or filtration methods. The IGF-I's calibration is traceable to the current WHO IGF-I preparation NIBSC Code 02/254 v 6.0. Analytical measureable range of 0.48 - 32.2 ng/mL allows for studies in a variety of physiological states. Sensitive to 0.025 pg/mL. Single 1 hour incubation at room temperature. Long shelf life of 24 months. For Research Use Only within the United States. CE Mark kit available for international purchases. Ansh Labs, located just south of Houston Texas, is an FDA registered manufacturer of diagnostic test kits, antibodies, antigens, and proteins.