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Your doctor may suggest an ACTH test if your level is greater than 200 ng/dL but less than 800 ng/dL.
This test is sensitive to circadian rhythms (the natural highs-and-lows that the body experiences during a day).
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Reference: Speroff L, Fritz MA, eds. Normal and Abnormal Sexual Development in Clinical Gynecologic Endocrinology & Infertility. Baltimore, Md: Williams & Wilkins; 2005.
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