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Allen Test for Hand Perfusion

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Questions and Answers

What is the primary purpose of a modified Allen test?

To determine adequate perfusion through the radial artery

To determine adequate perfusion through both the radial and ulnar arteries

To determine if there is adequate perfusion through the ulnar artery in case the radial artery becomes occluded (correct)

To check on reperfusion of the nail bed

Which of the following devices can measure COHb levels?

Pulse oximeter

PtcO2 monitor

CO-oximeter/hemoximeter (correct)

Blood gas analyzer

What does a positive result in a modified Allen test indicate?

Adequate ulnar circulation (correct)

Inadequate perfusion through the ulnar artery

Adequate perfusion through the radial artery

Inadequate perfusion through both the radial and ulnar arteries

What happens to the pH value if a blood sample is not quickly cooled in ice water?

It decreases Signup and view all the answers

Which of the following situations would NOT warrant a blood gas analysis?

Simple fracture Signup and view all the answers

What is the limitation of pressing on the nail bed to make it blanch and then releasing the pressure to check on reperfusion?

It is a general indicator of peripheral perfusion but does not confirm adequate circulation through either the radial or the ulnar arteries Signup and view all the answers

When may gloves be worn on both hands?

When blood may be contacted by either hand Signup and view all the answers

What is indicated by a PaO2 value in the 60 to 79 torr range?

Mild hypoxemia Signup and view all the answers

What is the result of an acute rise in CO2 of 10 mm Hg?

A drop in pH of 0.05 unit Signup and view all the answers

What is indicated by a PaO2 value greater than 80 torr with supplemental oxygen?

Corrected hypoxemia Signup and view all the answers

What is indicated by a low PaCO2 value coupled with normal bicarbonate concentration and normal base excess found with an alkalotic pH?

Uncompensated respiratory alkalosis Signup and view all the answers

What is the correlation between a PaO2 level and tissue oxygenation?

A PaO2 level of less than 80 torr correlates with tissue hypoxia Signup and view all the answers