Sometimes a special test called a water deprivation test needs to be done. This involves a test lasting up to 8 hours which is done in a hospital or specially equipped office. Your child will not be able to have anything to drink for the entire test. Blood and urine tests are done to see if the proper amount of ADH is being created. It can be given in the nose, by mouth, or by injection.
Prolactin is another hormone made in the pituitary gland.
Children with ONH often have abnormal levels of prolactin in their blood. This leads to no known health problems, but is often measured by the endocrinologist to test pituitary function.