Part of that extra thickness is caused by the protein keratin, which is nourished in deeper layers of the skin but forms a surface layer of dead cells on the epidermis. This extra thickness may also explain why your hands and feet become wrinkled when you soak in the tub.
Antidiuretic hormone (ADH), also called arginine vasopressin (AVP), is a hormone that helps regulate water balance in the body by controlling the amount of water the kidneys reabsorb while they are filtering wastes out of the blood. This test measures the amount of ADH in the blood.
The ACTH test measures the level of adrenocorticotropic hormone (ACTH) in the blood. ACTH is a hormone released from the pituitary gland in the brain. higher-than-normal level of ACTH may indicate: 1  Adrenal glands not producing enough cortisol (Addison disease). 2  Adrenal glands not producing enough hormones (congenital adrenal hyperplasia). 3  One or more of the endocrine glands are overactive or have formed a tumor (multiple endocrine neoplasia type I).