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The methylenetetrahydrofolate reductase (MTHFR) mutation test is used to detect two relatively common mutations in the MTHFR gene that are associated with elevated levels of homocysteine in the blood. It is not routinely ordered.
Hormonal Blood and Urine Tests. 1  ACTH stimulation test. The ACTH stimulation test is the most commonly used test for diagnosing adrenal insufficiency. 2  CRH stimulation test. When the response to the ACTH test is abnormal, a CRH stimulation test can help determine the cause of adrenal insufficiency.