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Diagnostic Tests for Diabetes Insipidus

Diabetes Insipidus: Diagnostic Tests

The list of diagnostic tests mentioned in various sources as used in the diagnosis of Diabetes Insipidus includes:

Home Diagnostic Testing

These home medical tests may be relevant to Diabetes Insipidus:

Tests and diagnosis discussion for Diabetes Insipidus:

Because DM is more common and because DM and DI have similar symptoms, a health care provider may suspect that a patient with DI has DM. But testing should make the diagnosis clear.

Your physician must determine which type of DI is involved before proper treatment can begin. Diagnosis is based on a series of tests, including urinalysis and a fluid deprivation test.

Urinalysis is the physical and chemical examination of urine. The urine of a person with DI will be less concentrated. Therefore, the salt and waste concentrations are low, and the amount of water excreted is high. A physician evaluates the concentration of urine by testing its specific gravity or osmolality.

A fluid deprivation test helps determine whether DI is caused by (1) excessive intake of fluid, (2) a defect in ADH production, or (3) a defect in the kidneys' response to ADH. This test measures changes in body weight, urine output, and urine composition when fluids are withheld. Sometimes measuring blood levels of ADH during this test is also necessary.

In some patients, an MRI (magnetic resonance imaging) of the brain may be necessary as well. (Source: excerpt from Diabetes Insipidus (DI): NIDDK)


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