Checking Testosterone Levels: Why the Time of Day Matters

If you’re a man and you're logging plenty of zzz’s, but feeling tired throughout the day, or experiencing loss of libido or erectile dysfunction, you may want to get your testosterone levels checked.

Michael Heile MD, a family medicine doctor at The Family Medical Group, explains why the time of day you have your levels checked is critical for getting an appropriate diagnosis.

Testosterone Levels: When Should I have Them Checked?

If you have your testosterone levels checked in the middle of the day, you are much more likely to present low testosterone levels, because testosterone levels naturally decline as the day goes on. Therefore, your results may be skewed.

“We try to draw blood as early as possible in the morning (between 8 and 8:30 a.m.) because that’s your best bet for catching testosterone in a low level if it really is low,” Dr. Heile explains.

Why the Test is Performed

A testosterone test measures the amount of the male hormone, testosterone, in the blood. Both men and women produce this hormone.

In men, the testicles produce most of the testosterone in the body. Levels are often checked if you have symptoms of low testosterone, which may include:

  • Fatigue
  • Impotence
  • Low libido
  • Infertility
  • Thinning of the bones

Normal results usually range from 300 to 1,000 ng/dL.


    Tags: Miscellaneous, Senior Health

    Last Updated: November 19, 2015