Distribution of total testosterone levels by age
Distribution of free testosterone levels by age

Study Analysis Description

The distribution of total and free testosterone levels by age were assessed in three geographically distinct cohorts of community-dwelling men... [Framingham Heart Study 2nd and 3rd generation (n=3352; termed FHS broad sample), European Male Aging Study (n=3219), and the Osteoporotic Fractures in Men Study (n=1488)]. The distribution of total and free testosterone levels by age was similar in the three cohorts. The distributions within the FHS broad sample are presented here.

  • The rate of age-related decline in serum testosterone levels varies in different individuals and is affected by chronic disease, adiposity, and medications.2

THE 2010 ENDOCRINE SOCIETY GUIDELINES RECOMMEND TREATING APPROPRIATE SYMPTOMATIC MEN WITH LOW TESTOSTERONE.2

2010 Endocrine Society guidelines for diagnosing hypogonadism2:

  • Measuring morning total testosterone to diagnose hypogonadism in men with consistent signs and symptoms
  • A second test measuring morning total testosterone to confirm the diagnosis.
Tests for identifying androgen deficiency in men

*For men ages 18-69. Values vary among labs and assays.