skip to main content

VO2 Normal — FRCA Primary MCQ

Instant feedback + full explanation. One question, done properly.

HardPhysiology - RespiratoryVO2 NormalFRCA Primary

A 70 kg resting adult has an oxygen consumption of approximately 3.5 mL/kg/min. What is the closest total oxygen consumption?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — 250 mL/min, calculated from 70 multiplied by 3.5

The best answer is “250 mL/min, calculated from 70 multiplied by 3.5”. Resting oxygen consumption is commonly approximated as 3.5 mL/kg/min. For a 70 kg adult, 70 × 3.5 equals 245 mL/min, so 250 mL/min is the closest option. Oxygen consumption rises markedly with fever, shivering and exercise; it should not be assumed to remain at this reference value in critical illness.

Reference: Resuscitation Council UK, Adult Advanced Life Support Guidelines 2025: https://www.resus.org.uk/cy/node/36438