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.
Other risks associated with having blood drawn are slight, but may include:
More sensitive tests can not only measure the total amount of testosterone in the blood, but can also determine how much of that total amount is "free" or "bioavailable" testosterone.
Webster RA. Reproductive function and pregnancy. In: McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia, Pa: Saunders Elsevier;2006:chap 25.
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