How do you diagnose pituitary diabetes insipidus?

Agree w/ Dr. Nguyen. Diagnosing Diabetes insipidus (DI) is based on symptoms, medical history, and lab tests. Differentiating kidney-level DI and central (brain/pituitary) DI can be done by measuring vasopressin levels (very difficult, only a few labs offer this test) or observing how a person responds to an injection of vasopressin. Central DI = low levels of vasopressin and a strong response to a test dose.
Many. Diabetes insipidus is diagnosed through: clinical history, lab + urine tests, and imaging studies (mri). A water-deprivation test may sometime be needed to know whether the problem is at the brain level or at the kidney.