College of Massage Therapists of British Columbia (CMTBC) Practice Exam

The Allen Test is primarily used to assess what?

1. Efficiency of hand muscles

2. Blood supply to the hand

3. Joint mobility of the wrist

4. Nerve function in the upper extremity

The correct answer is: Blood supply to the hand

The Allen Test is specifically designed to assess blood supply to the hand, particularly the function of the radial and ulnar arteries. This test is performed to evaluate how well blood is being supplied to the hand and to identify any potential circulatory issues. It involves occluding both arteries at the wrist and observing the color change in the hand upon releasing one artery, thereby determining the adequacy of collateral circulation. This is crucial in situations where procedures like arterial punctures or surgeries may be performed since it helps ensure that there is sufficient blood flow to the hand following the intervention. In contrast, the other options focus on different aspects of hand function. The efficiency of hand muscles pertains to strength and coordination, which is not the focus of the Allen Test. Joint mobility of the wrist involves evaluating the range of motion of the joints, while nerve function assessments would include tests for sensation or motor function but do not specifically evaluate blood supply. Therefore, the optimal understanding of the Allen Test lies in its role in determining the vascular integrity of the hand.