Phlebotomy Test Arterial Blood Gas Collection 3

Question 1

Which of the following is a contraindication to using the brachial artery for ABG collection?

Accepted Answer

There is no collateral circulation to the forearm if the brachial artery is damaged

Answer

The brachial artery is the sole blood supply to the forearm; there is no collateral circulation, so damage can cause forearm and hand ischemia—a significant risk consideration.

Question 2

A patient has a PaO2 of 58 mmHg while breathing room air. This finding indicates:

Accepted Answer

Hypoxemia requiring clinical intervention

Answer

PaO2 of 58 mmHg is below the normal range (80–100 mmHg on room air) and represents clinically significant hypoxemia requiring assessment and potential supplemental oxygen.

Question 3

An ABG shows: pH 7.30, PCO2 55 mmHg, HCO3 26 mEq/L. The phlebotomist correctly identifies this as:

Accepted Answer

Respiratory acidosis (uncompensated)

Answer

pH 7.30 (acidotic), PCO2 55 (elevated—respiratory parameter), HCO3 26 (normal—no metabolic compensation yet) indicates uncompensated respiratory acidosis.

Question 4

The femoral artery is used as an alternative ABG site primarily in which clinical scenario?

Accepted Answer

When radial and brachial sites are inaccessible (e.g., severe peripheral vascular disease, cardiac arrest)

Answer

The femoral artery is reserved for situations where upper extremity access is impossible, such as in severe peripheral vascular disease, bilateral AV fistulas, or cardiac arrest resuscitation.

Question 5

How much pressure must be applied to a radial artery puncture site to achieve hemostasis in a patient with normal coagulation?

Accepted Answer

At least 3–5 minutes of continuous firm pressure

Answer

A minimum of 3–5 minutes of continuous, firm pressure is required at an arterial puncture site in a normally coagulating patient; less time risks hematoma formation.

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Phlebotomy Test Arterial Blood Gas Collection 3