Low Testosterone There are certain standards that allows the correct operation of the human body. The level of hormones should be sufficient to make the body function properly, To learn testosterone blood test is working. It is necessary to do it in the morning because it can be changed during the day. The default value for testosterone 270-1070 ng / dl. (In men). It is used to a certain extent affected by the individual laboratories; therefore, the range may differ. It is more difficult to track the accuracy of the tests in females. Harvard Medical SchoolTestosterone normally declines as men age. However, a clear definition of "low" testosterone does not yet exist. "No one knows what is really low," said Dr. Joel Finkelstein, endocrinologist and associate professor at Harvard Medical School . "The authors of the study, the 250 [nanograms per deciliter],\
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