Reviewed by Clifton Jackness, MD, attending physician in Endocrinology, Diabetes, and Metabolism at Lenox Hill Hospital and The Mount Sinai Medical Center in New York City Age-related decline of ...

Total testosterone measures the full amount of the hormone in your blood, while free testosterone represents the small, active portion your body can actually use to support muscle growth, energy, mood ...

Testosterone levels are at their highest during adolescence and early adulthood. Testosterone levels may start to decline after age 30 years in males and between ages 45 and 55 years in females.

Testosterone is the quintessential male hormone (androgen), and it’s a busy one, helping to regulate intimate function, muscle mass, red blood cell count, mood, and more. But not all testosterone in ...

Adult males typically have between 265 and 923 nanograms per deciliter of testosterone (ng/dL) in their blood, while adult females have far less. Typical levels vary depending on age, sex, and health.

Testosterone tests measure levels of testosterone in the blood. At-home test kits can be convenient, but they cannot diagnose underlying health conditions that cause high or low testosterone. Share on ...

When it comes to understanding testosterone levels, traditional testing reports one number: total testosterone. But there's more to the story, especially for men who may be experiencing symptoms of ...

New research finds that more men have suboptimal testosterone levels than previously known, and it may be putting these men at risk. A male's total testosterone level may be linked to more than just ...

The hormone testosterone plays an important role in men’s health. For starters, it helps to maintain muscle mass, bone density, and sex drive. Testosterone production is at its highest in a man’s ...

Sun, January 11, 2026 at 1:56 PM UTC If you've ever had your testosterone levels checked, you may have come across two different numbers: one for free testosterone and the other for total testosterone ...