Your testosterone result is only meaningful in context. A number like 450 ng/dL could be excellent for a 60-year-old or concerning for a 35-year-old with symptoms. Knowing where you stand relative to age-matched norms and optimal function targets gives your result real meaning. Testosterone Level Zones Zone Total T (ng/dL) What It Means Critically Low Below 200 Severe hypogonadism; significant health risks; medical treatment warranted Low 200–350 Clinically deficient; treatme

Total testosterone tells you how much is in your blood. Free testosterone tells you how much your body can actually use. The difference between those two numbers — shaped entirely by SHBG — can be the difference between a man who feels fine and a man who is symptomatic despite an apparently normal total T. The Vermeulen Formula The most widely used method for calculating free testosterone from total T and SHBG is the Vermeulen equation (1999). It accounts for SHBG-binding aff

No quiz can diagnose hypogonadism — only blood tests can do that. But a structured symptom assessment can tell you whether your experience pattern is consistent with testosterone deficiency, and whether getting tested is a priority. The questions below are adapted from validated clinical screening tools (ADAM and AMS questionnaires) used by endocrinologists and urologists. The Self-Assessment Answer each question honestly based on the past 4 weeks. Rate your experience: 0 = N