Oxygen Delivery Equation — FRCA Primary MCQ
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Correct answer: A — Cardiac output multiplied by arterial oxygen content
The best answer is “Cardiac output multiplied by arterial oxygen content”. Systemic oxygen delivery equals cardiac output multiplied by arterial oxygen content. Oxygen content includes haemoglobin-bound oxygen and a small dissolved component, so PaO2 or saturation alone is insufficient. Care is needed to use compatible units when calculating a numerical result.
Reference: Resuscitation Council UK, Adult advanced life support guidelines: https://www.resus.org.uk/library/2025-resuscitation-guidelines/adult-advanced-life-support-guidelines