Provided below are ELISA kits targeting phosphatidylinositol glycan anchor biosynthesis class A, a human protein encoded by PIGA. This protein is 484 amino acids long, with a mass of 54.1 kDa, and is a member of the Glycosyltransferase group 1 family, Glycosyltransferase 4 subfamily. 3 isoforms have been identified. It is also an enzyme classified as a(n) phosphatidylinositol N-acetylglucosaminyltransferase. There is a noted implication in Paroxysmal nocturnal hemoglobinuria 1. Other alias names for this protein include: phosphatidylinositol N-acetylglucosaminyltransferase subunit A, GLCNAC-PI synthesis protein, GPI anchor biosynthesis, class A GlcNAc-inositol phospholipid assembly protein, GPI3, MCAHS2, and PIG-A.