Individual test · Labcorp 500726

Testosterone, Free, Mass Spectrometry/Equilibrium Dialysis (Endocrine Sciences)

This test measures the specific amount of testosterone in your blood that is not attached to proteins, known as free testosterone. Because this is the active form of the hormone that your body can actually use, the test helps evaluate symptoms of hormonal imbalance even if total testosterone levels appear normal. It helps doctors assess conditions related to excess or deficient hormone levels, such as fatigue, muscle weakness, or fertility concerns. However, this test does not determine the specific medical cause of the abnormal levels or provide a diagnosis on its own.