A testosterone test measures hormone levels in the blood. Low testosterone in men can contribute to increased fat mass and reduced muscle mass. In such cases, medically supervised testosterone replacement therapy may improve body composition and indirectly support weight loss. However, the test alone is not a weight loss tool. For individuals with normal levels, it provides no benefit, and unnecessary testosterone therapy carries risks (e.g., cardiovascular events, sleep apnea). Evidence for weight loss via testosterone is moderate and limited to hypogonadal men. In women, evidence is even weaker. Testing should only be considered if symptoms of deficiency (fatigue, low libido, muscle loss) are present and after medical evaluation. Without clinical indication, testosterone testing is not recommended for weight management.
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