Original Article: http://www.mayoclinic.com/health/medical/IM00780
A test called the Finkelstein test can help your doctor confirm de Quervain's tenosynovitis. To do this test, you bend your thumb down across the palm of your hand, and then cover your thumb with your fingers. Next, bend your wrist toward your little finger. If this causes pain, you likely have de Quervain's tenosynovitis.