A doctor’s fingers can potentially affect the results of the Allen test. Because false results may lead to complications, the test must be as accurate as possible. To avoid inaccuracies, some doctors use the three-digit method. Rather than compressing the arteries with their thumbs, the physician uses the first three digits of their hand. While the doctor is pressing on the arteries, the patient opens and closes their hand 10 times. Then, the patient holds their hand open.

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