Thanks for writing to the forum!
Extreme thirst is seen in diabetes, both diabetes mellitus and diabetes insipidus. You need to get your blood sugar and adrenal gland function done along with kidney function test.
Hope this helps. It is difficult to comment beyond this at this stage. Do consult your doctor. Please let me know if there is any thing else and do keep me posted. Take care!
The tests you have posted are normal. So you may not have diabetes mellitus. But you will still have to rule out 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.
A doctor 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 measuring how many particles are in a kilogram of water or by comparing the weight of the urine with an equal volume of distilled water.
A fluid deprivation test helps determine whether DI is caused by one of the following:
• excessive intake of fluid
• a defect in ADH production
• 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, a magnetic resonance imaging (MRI) of the brain may be necessary as well.” Refer: http://kidney.niddk.nih.gov/kudiseases/pubs/insipidus/index.htm#diagnosis
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
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