Generally, the normal values of testosterone in men are 260-1590ng/dl and 210-750ng/dl (greater than 50 years of age). As you can see above, normal testosterone values change with age. Testosterone, also known as testosterone, is a steroid hormone secreted by the testes and is a component of androgens that maintains muscle strength and mass. To ensure the accuracy of the test results, patients are advised to visit the clinic at 7-8 am for a fasting blood draw. Generally, if testosterone levels are lowered, testicular hypoplasia and hypopituitarism are considered. If the testosterone level is elevated, adrenal cortical hyperplasia and testicular tumors are more likely to be considered, and other tests are needed for further clarification.