What is the definition of low testosterone (Low-T)?
- Testosterone is a hormone required for male development and sexual function and is produced primarily in the testicles.
- Testosterone is responsible for building muscle and bone mass, sperm production, and sex drive.
- Testosterone influences male pattern fat distribution, bone density, and red blood cell production.
- In the normal developing male, testosterone peaks during early adulthood. Once you reach age 30, testosterone levels slowly decline by approximately 1% a year. This is a normal part of aging.
What are normal ranges or levels of testosterone in men?
The low limit of testosterone levels in men is about 300 nanograms per deciliter and the upper normal limit is approximately 1000-1200 ng/dl. A low level needs to be investigated further to distinguish it from normal aging.