Ready-to-use ELISA kits are available for the detection of Copeptin, an alias of the protein, arginine vasopressin. The official gene symbol is AVP. The protein, with a mass of 17.3 kDa and length of 164 residues, is reported to be secreted. It is a member of the Vasopressin/oxytocin family and may be known by other names, including: vasopressin-neurophysin II-copeptin, prepro-arginine-vasopressin-neurophysin II, neurohypophyseal, copeptin, antidiuretic hormone, and vasopressin-neurophysin 2-copeptin, and ARVP.