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Antidiuretic Hormone (ADH) Test
Antidiuretic Hormone (ADH) Test
Antidiuretic Hormone (ADH) 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 kidneys respond to ADH by conserving water and producing urine that is more concentrated. The retained water dilutes the blood, lowers its osmolality, and increases blood volume and pressure. If this is not sufficient to restore the water balance, then thirst is also stimulated so that the affected person will drink more water.
If there is too little ADH or the kidneys do not respond to ADH, then too much water is lost through the kidneys, the urine produced is more dilute than normal, and the blood becomes more concentrated. This can cause excessive thirst, frequent urination, dehydration, and
if not enough water is ingested to replace what is being lost – high blood sodium (hypernatremia).
If there is too much ADH, then water is retained, blood volume increases, and the person may experience nausea, headaches, disorientation, lethargy, and low blood sodium (hyponatremia).
The ADH test is not widely used to diagnose these conditions. Often, a diagnosis is made on the basis of clinical history and other laboratory tests, such as urine and blood osmolality and electrolytes.
ADH deficiency is called diabetes insipidus. There are two types of this disorder: central and nephrogenic.
Sample:
Whole blood.
When it is order :
An ADH test may be ordered when a person has excessive thirst and frequent urination and the health practitioner suspects diabetes insipidus.
Antidiuretic Hormone (ADH) Test
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