This ELISA kit applies to the in vitro quantitative determination of AA concentrations in serum, plasma and other biological fluids.This ELISA kit uses Competitive-ELISA as the method. The microtiter plate provided in this kit has been pre-coated with AA. During the reaction, AA in the sample or standard competes with a fixed amount of AA on the solid phase supporter for sites on the Biotinylated Detection Ab specific to AA. Excess conjugate and unbound sample or standard are washed from the pla