Hypopituitarism laboratory findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Laboratory Findings
Electrolyte and Biomarker Studies
- ACTH stimulation test: The ACTH stimulation test is the most common test for patients who are suspected of diagnosing adrenal insufficiency. During this test, before and after being injected ACTH, the patient is detected with the level of blood cortisol and urine cortisol. In normal person, after an ACTH injection, it may show a rise in blood and urine cortisol levels. Patients with causes of adrenal insufficiency have little or no increase in cortisol levels.
- CRH stimulation test: This test can differ the primary and secondary adrenal insufficiency. In this test, the patient is injected synthetic CRH and measured blood cortisol before and 30, 60, 90, and 120 minutes after the injection. The leval of blood cortisol in people with primary adrenal insufficiency such as Addison’s disease, demonatrates high levels of ACTH but no cortisol. For the patients with secondary adrenal insufficiency, they appear absent or delayed ACTH.
- Triple bolus test: A provocative test measures the secretory response of the pituitary to a stimulus (other hormones, drugs, exercise, etc.) by measuring serum levels of the hormone involved.