Phlebotomy Test Arterial Blood Gas Collection 2

Question 1

For an ABG specimen, which anticoagulant is used in the collection syringe?

Accepted Answer

Heparin (liquid or lyophilized)

Answer

Heparin (as liquid sodium heparin or dry/lyophilized heparin) is the anticoagulant used in ABG syringes because it does not affect blood gas values when used in proper amounts.

Question 2

How should an ABG specimen be transported to the laboratory if analysis will be delayed beyond 30 minutes?

Accepted Answer

In iced slush or ice water to slow cellular metabolism

Answer

ABG specimens must be transported in iced slush/ice water to slow cellular metabolism (O2 consumption and CO2 production) that would otherwise alter blood gas values.

Question 3

What is the significance of a 'negative Allen test' before radial artery puncture?

Accepted Answer

There is inadequate ulnar collateral circulation; the radial artery should not be punctured

Answer

A negative Allen test means the ulnar artery cannot adequately supply the hand if the radial artery is damaged; proceeding with radial puncture risks hand ischemia.

Question 4

A phlebotomist notes pulsatile blood flow filling the ABG syringe spontaneously. This indicates:

Accepted Answer

The needle is correctly positioned within the artery

Answer

Spontaneous pulsatile blood flow into the ABG syringe without aspiration confirms correct arterial needle placement, as arterial pressure drives blood into the syringe.

Question 5

Which of the following patients would have a CONTRAINDICATION to radial artery puncture at a specific site?

Accepted Answer

A patient with a negative Allen test at that wrist

Answer

A negative Allen test at that wrist indicates absent ulnar collateral circulation, making radial artery puncture at that site contraindicated due to risk of hand ischemia.

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Phlebotomy Test Arterial Blood Gas Collection 2