X-rays. These can check for bone problems
caused by past injury,
arthritis, recently broken or dislocated bones, or
tumors. X-rays aren't used to diagnose carpal tunnel syndrome. But they can be
helpful for finding signs of arthritis or an old or new wrist or neck
injury that may be adding to your symptoms.
Ultrasound, to look at the size of the median nerve.
It is inexpensive, comfortable, and quick. But its use for carpal tunnel
syndrome diagnosis is still unproven and fairly uncommon.
MRI. This imaging test can find swelling
of the median nerve, narrowing of the carpal tunnel, or problems with
circulation of blood through the carpal tunnel.