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Morning Testosterone Draw

Meaning

The Morning Testosterone Draw is a specific, standardized clinical procedure involving the collection of a patient’s blood sample, typically between 7:00 AM and 10:00 AM, for the purpose of accurately measuring circulating total and free testosterone levels. This precise timing is mandated by the inherent circadian rhythm of testosterone, which peaks in the early morning hours, providing the most reliable assessment of the patient’s maximal endogenous production. Clinically, this draw is the foundational diagnostic test for evaluating potential hypogonadism or other endocrine dysfunctions.