Arginine vasopressin (AVP), aswell accepted as argipressin, antidiuretic hormone (ADH), or artlessly as vasopressin, is a nine amino acerbic peptide hormone that plays a primary role in the adjustment of renal baptize elimination and a accessory role in the adjustment of cardiovascular action in mammals. AVP acts on epithelial beef of the urinary amplitude to augment the reabsorption of water, consistent in absorption of urine and concoction of claret serum. It aswell stimulates the binding of capillaries and arterioles, adorning claret pressure.Normal levels of AVP in serum are 0.4-5.2 pg/ml.5,6 Claret levels of AVP are animated in patients with above and aswell anxious-retarded depression, as able-bodied as in patients with congestive affection failure. Cayman’s AVP EIA is a aggressive appraisal that can be acclimated for the altitude of AVP from claret and serum. The appraisal is characterized by an IC50 (50% B/B0) amount of ~220-380 pg/ml and an IC80 (80% B/B0) amount of ~45-60 pg/ml.