Total Testosterone (Serum/Plasma)

Why Is This Test Done?

Your healthcare provider may order a total testosterone test to evaluate symptoms like low libido, infertility, irregular menstrual cycles, or signs of hormonal imbalances. It can also be used in diagnosing conditions such as hypogonadism (low testosterone), Cushing’s syndrome, or polycystic ovary syndrome (PCOS). In men, it may be checked during evaluations for delayed puberty or unexplained fatigue.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw if your test involves a blood sample. Wear comfortable clothing and plan to stay for about 15 minutes. If you’re taking medications that affect hormone levels, inform your provider beforehand.

What the Results Mean

Testosterone levels vary by age, sex, and health status. Results are interpreted in the context of your medical history and symptoms. Low levels may indicate hormonal deficiencies, while high levels could signal conditions like Cushing’s syndrome or tumors. Your provider will discuss these findings with you.

Common Conditions Testosterone Levels Are Checked For

This test is often used to diagnose or monitor conditions like low testosterone (hypogonadism) in men, delayed puberty, infertility, or hormonal imbalances in women. It may also be part of a broader evaluation for metabolic disorders, such as obesity or diabetes, where hormone dysfunction is suspected.