Reviewed by Varnada Karriem-Norwood on May 17, 2012

Sources

Sheldon Marks, MD Urologist; Male Infertility Specialist, Prostate Cancer Specialist, Microsurgical Vasectomy Reversal Specialist, Tucson, AZ.

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Video Transcript

: What time of day is best to check my testosterone level?

Sheldon Marks, MD: For a man, it's probably best to get a testosterone level checked late morning…8 to 10.

Interviewer: Why is that?

Sheldon Marks, MD: That's when it peaks. There's normal fluctuation in the testosterone throughout the day, usually morning is one of them, which is why men's libido, their sex drive, tends to be higher in the morning because their testosterone levels are higher.