Water deprivation test
Water Deprivation Test
The Water Deprivation Test (pronunciation: /ˈwɔːtər dɪˌprɪvɪˈteɪʃən tɛst/) is a medical procedure used to diagnose polydipsia and diabetes insipidus.
Etymology
The term "Water Deprivation Test" is derived from the English words "water", "deprivation" (from Latin deprivare meaning 'to take away') and "test" (from Old French test meaning 'small pot').
Procedure
The Water Deprivation Test involves withholding water from the patient for a certain period of time, usually 12 to 14 hours, under close medical supervision. The patient's urine output and osmolality are then measured. If the patient has diabetes insipidus, they will continue to produce large amounts of dilute urine despite water deprivation.
Related Terms
- Polydipsia: Excessive thirst and fluid intake.
- Diabetes insipidus: A condition characterized by excessive thirst and excretion of large amounts of severely dilute urine.
- Osmolality: A measure of the number of dissolved particles in a fluid.
- Urine: A liquid by-product of metabolism in humans and in many animals.
See Also
- Desmopressin: A medication used to treat diabetes insipidus, bedwetting, and certain other conditions.
- Vasopressin: A hormone produced in the hypothalamus and released by the posterior pituitary gland; it plays a key role in maintaining the body's water balance.
External links
- Medical encyclopedia article on Water deprivation test
- Wikipedia's article - Water deprivation test
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