Diagnosis of Carpal Tunnel Syndrome

Reading time: 2 min

The symptomatology of carpal tunnel syndrome is quite characteristic and helps, in the majority of cases, to direct the doctor in its diagnosis.

One hand presses on the carpal tunnel area of the other hand.

Physical examination. An examination is performed on the sensitivity and forces of the hand and fingers, as well as manoeuvres that trigger the symptoms. These manoeuvres are:

  • Tinel Test. Consists of gently tapping the area of the palmar tendon with the fingers in order to provoke tingling and detect if there is inflammation of a nerve.
  • Phalen Test. Consists of maintaining the wrist in forced flexion for 1 minute. If there is compression of the median nerve in the carpal tunnel, tingling usually appears in the palm of the hand and in the fingers that depend on the median nerve, although the discomforts are normally produced in the tips of the fingers.
  • Durkan Sign. The characteristic symptoms are seen on applying pressure over the area of the palmar tendon.

 

Hand with electrodes

Electrophysiological tests. Usually performed to measure the nerve conduction of the wrist where there is local compression of the nerve. It consists in the placing of electrodes on the hand and wrist. Small electric shocks are applied and the velocity with which the nerve impulses are transmitted is measured.  Occasionally, it is complemented by an electromyogram (EMG) that consists of the introduction of a needle into the muscle innervated by the nerve that is being studied in order to measure its electrical activity. In severe chronic cases there may be fibrillations of the short abductor muscle of the thumb.

Wrist fracture seen on X-ray

Image tests. Studies using radiology, ultrasound, or magnetic resonance can be useful to discover any unsuspected disease, to measure the size of the tunnel or visualise the nerve compression area. But at the moment diagnostic imaging is not useful for the diagnosis of carpal tunnel syndrome.

Blood collection tube

Laboratory tests There are no laboratory tests that indicate the presence of a carpal tunnel syndrome, but there are diseases, such as diabetes or hypothyroidism,  which are often present when there is carpal nerve damage.

 

Blood test tube with a low red blood cell count or anemia

Other diseases. Such as fibromyalgia, vasculitis, or pernicious anaemia may show symptoms similar to carpal tunnel syndrome. The intervention by a general medical practitioner, rheumatologist, or neurologist helps in its diagnosis.

Substantiated information by:

Joaquim Forés
Miriam Morató Dalmau
Núria Millán Villanueva
Raquel Vilarrasa Sauquet

Published: 17 July 2018
Updated: 17 July 2018

The donations that can be done through this webpage are exclusively for the benefit of Hospital Clínic of Barcelona through Fundació Clínic per a la Recerca Biomèdica and not for BBVA Foundation, entity that collaborates with the project of PortalClínic.

Subscribe

Receive the latest updates related to this content.

Thank you for subscribing!

If this is the first time you subscribe you will receive a confirmation email, check your inbox

An error occurred and we were unable to send your data, please try again later.