digital Allen test
A clinical assessment of digital arterial circulation used to evaluate vascular supply before microsurgical procedures involving the fingers.
Full Definition
The digital Allen test is a simple bedside examination used to assess the adequacy of collateral circulation in the fingers, particularly important in hand and microsurgery procedures. The test involves occluding both digital arteries of a finger, releasing one vessel, and observing capillary refill to determine if adequate blood flow exists through that particular vessel. This assessment is crucial before procedures such as digital replantation, free toe-to-thumb transfer, or any microsurgical procedure that might compromise one of the digital arteries. Poor collateral circulation identified by this test may alter surgical planning or technique selection.
Usage
Usage note: Capitalize 'Allen' as it refers to the physician's name; specify 'digital' to distinguish from other Allen tests.
In Context
- "Preoperative digital Allen test confirmed adequate collateral circulation before proceeding with the thumb reconstruction." — Pre-operative assessment
- "A positive digital Allen test indicated sufficient radial digital artery flow for the planned procedure." — Clinical evaluation