Low testosterone or testosterone deficiency, also known as hypogonadism, is a condition in which patients develop symptoms.

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A testosterone test checks how much testosterone is in your blood. Testosterone is the primary reproductive (sex) hormone for people assigned male at birth. People assigned female at birth also ...

Low testosterone is when testosterone levels fall below 300 ng/dL. A blood test called a serum testosterone test can determine your testosterone level. Testosterone replacement therapy (TRT ...