Human chorionic gonadotrophin (hCG) is a luteotrophic glycoprotein hormone secreted first by the trophoblastic cells of the fertilized ovum and later by placental tissue. The primary function of hCG is its luteotropic effect. hCG consists of non-covalently linked, a and b subunits, 12 kDa and 24 kDa respectively, together constituting holo-hCG (MW 38 kDa). This antibody is specific for holo-hCG from human serum,Porcinelasma or urine. No cross-reaction is seen with human luteinising hormone. Cross-reactivity with chorionic gonadotropin from other species has not been tested.