During puberty, testosterone helps build a man’s muscles, deepens his voice, and boosts the size of his genitals. In adulthood, it keeps a man’s muscles and bones strong and maintains his interest in sex. In short, it’s what makes a man a man (at least physically).
After age 30, most men begin to experience a gradual decline in testosterone. A decrease in sex drive sometimes accompanies the drop in testosterone, leading many men to mistakenly believe that their loss of interest in sex is simply due to getting older.
A lot of health symptoms are mirrored by other medical problems and can be attributed to diabetes, depression, high blood pressure, and coronary artery disease. Low testosterone may be at the root of problems.
This blood test can find out whether your testosterone levels are within the normal range.