ARGININE VASOPRESSIN / ANTI DIURETIC HORMONE ( ADH) LabTest

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Arginine vasopressin (AVP), or antidiuretic hormone (ADH), is a nonapeptide produced by the hypothalamus and released from the posterior pituitary in response to extracellular fluid hyperosmolarity and hypovolemia. AVP promotes concentration of the urine by increasing water reabsorption in the kidney tubules. Inadequate AVP action causes diabetes insipidus (DI), a syndrome characterized by nonglycosuric polyuria, polydipsia, and dehydration. Central DI refers to insufficient AVP release due to diseases of the hypothalamus, pituitary stalk, and pituitary gland. Nephrogenic DI is the result of impaired renal responsiveness to AVP and may be congenital or due to renal disease, hypokalemia, hypercalcemia, systemic disorders (eg, multiple myeloma and amyloidosis), or drugs (eg, lithium or demeclocycline and ethanol).


DI diagnosis is based on the presence of hyperosmolar serum with inappropriately dilute urine. Central and nephrogenic DI can be differentiated by measuring the plasma AVP level and interpreting it in light of the simultaneous plasma osmolality.


The syndrome of inappropriate secretion of antidiuretic hormone (SIADH) is manifested by hyponatremia and inappropriately concentrated urine. The diagnosis is confirmed by plasma or urine AVP levels inappropriate for serum osmolality.

http://www.questdiagnostics.com
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