In Type 1 diabetes, your body's own immune system destroys the insulin - producing cells of the pancreas, resulting in a complete deficiency of the hormone insulin. (articles.mercola.com)
Diabetes mellitus is an absolute or relative deficiency of the hormone insulin. (vetsulin.com)
This test determines if a person has a deficiency of the hormones used to regulate the balance of salt and water in the body. (sciencedaily.com)