Provocative / Suppressive lab tests. These are tests that are designed to cause or prevent hormones from being secreted to help identify the cause of a pituitary disorder. These include glucose tolerance tests to help diagnose acromegaly, arginine infusion tests to help detect growth hormone deficiency and dexamenthasone suppression tests and inferior petrosal sinus sampling to help diagnose Cushing's disease.
Urinalysis. This involves collecting a sample of urine for chemical analysis. Because hormone levels naturally go up and down during the day and night, it may be necessary to do a 24-hour urine collection.
Neuro-opthalmological evaluation, including a visual field exam. This involves looking at a screen with flashing lights and pressing a button when you see one of the lights. The pattern of which flashing lights you can or can't see maps areas of your vision affected by the tumor.