Arterial Blood Gas Analysis · Pathology

Which parameter primarily reflects respiratory function in ABG analysis?

  1. HCO3−
  2. Base excess
  3. PaCO2
  4. Serum lactate
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Correct answer: PaCO2

PaCO2 reflects the partial pressure of carbon dioxide in arterial blood and is controlled by ventilation. It is the primary respiratory component in acid-base balance.

Difficulty: Medium Question 4 of 20

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