Prehn's sign

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Prehn's sign is a medical diagnostic indicator that helps determine whether the presenting injured testicle is caused by acute epididymitis or from testicular torsion.

According to Prehn's sign, the physical lifting of the testicles relieves the pain of epididymitis but not pain caused by testicular torsion.

Negative Prehn's sign indicates no pain relief with lifting the affected testicle, which points towards testicular torsion which is a medical emergency and must be relieved within 6 hours.

Positive Prehn's sign indicates there is pain relief with lifting the affected testicle, which points towards epididymitis.