Total testosterone includes bound and unbound hormone. Free testosterone is the unbound portion. Total is usually tested first; free testosterone can help explain borderline results or changes in SHBG.
A standardized study found total testosterone of 264 to 916 ng/dL in healthy, nonobese men aged 19 to 39. This is a study reference range, not a treatment target. Your lab method, symptoms and repeat results matter.
Intramuscular testosterone cypionate has an approximate half-life of eight days in U.S. prescribing information. Half-life describes how drug levels fall. It does not tell you when to inject or how soon symptoms will change.
Low testosterone can start with a problem in the testes or the signals that control them. Illness, certain medicines, sleep problems and body weight can also contribute. Finding the cause helps determine the next step.
A low testosterone diagnosis usually starts with symptoms and two separate morning blood tests. A physician then reviews possible causes and decides whether more testing is needed. One low result is not enough.
Low sex drive, fewer spontaneous erections and persistent fatigue can occur with low testosterone. These symptoms have other causes too. Morning blood tests and a physician evaluation help identify the problem.
The best medicine to boost testosterone is the one that matches why your level is low. For a man with confirmed low testosterone who is not trying to have children, testosterone replacement therapy has the strongest evidence. For a man whose brain signals are low, or who wants to protect his fertility, a medicine that … Read more
TRT monitoring checks symptom improvement, side effects and blood-test trends. Testosterone, hematocrit, blood pressure and prostate health may need review. Your medicine and health history determine the tests and timing.
A testosterone blood test usually measures total testosterone first. Morning timing, sleep, illness and medicines can affect the result. Follow your lab instructions, and expect a repeat morning test if the first result is low.
