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