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Evaluation of Collateral Circulation Prior to Blood Sampling (Modified Allen Test - Ultrasonography)

Purpose:

To evaluate collateral circulation in the hand before radial arterial blood sampling is performed.

Specialty:

Clinical Laboratory

Objective:

other testing

ICD-10:

I74.2

Description:

Before sampling arterial blood from the radial artery the patient must be evaluated for the adequacy of collateral circulation. This is to ensure that infarction of all or part of the hand does not occur if a thrombus of the artery should occur after the arterial sampling.

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