A person with central diabetes insipidus produces more than 3 liters of urine a day. Urinalysis will show a low concentration of salt in the urine.
A water restriction test is used to look at how well the kidney works and how much urine is produced. This test is done during a hospital stay. Results are checked every hour. A blood test to check plasma sodium concentration is done every 2 hours. Serum sodium/salt concentration may be high if the condition is untreated.
An MRI of the head may show a problem in or near the pituitary gland.
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