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An antepartum condition is a condition occurring or existing before birth; the prenatal period; antenatal care.
Antidiuretic hormone, also called arginine vasopressin (AVP), is a hormone produced by the hypothalamus in the brain and stored in the posterior pituitary gland at the base of the brain. ADH helps regulate water balance in the body. With this test, those with SIADH typically have decreased blood sodium and osmolality. 2  They do not produce as much urine as expected, urine osmolality is high relative to serum osmolality, and the ADH concentration is in excess of what would be appropriate and does not decrease appropriately with water loading.