PURLS: It's time to reconsider early-morning testosterone tests.
Guidelines recommend collecting an early-morning sample to compensate for the natural diurnal variation in testosterone levels. But for men 45 and older, this is unnecessary. Because the natural diurnal variation in testosterone levels tends to diminish with age, it is acceptable to test men ages 45 and older before 2 pm.
Department of Family and Community Medicine, University of Missouri-Columbia, MO, USA.
Natalie
N
Long
University of Chicago, Department of Family Medicine, IL, USA.
Liz
L
Nguyen
Department of Family and Community Medicine, University of Missouri-Columbia, MO, USA.
James
J
Stevermer
D007172:Erectile Dysfunction / Q000097:blood*; D006801:Humans; D008297:Male; D013739:Testosterone / Q000097:blood*
D013739:Testosterone