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Portal Vein 75% Flow — FRCA Primary MCQ

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ModeratePhysiology - Gastrointestinal & HepaticPortal Vein 75% FlowFRCA Primary

Regarding hepatic blood flow the portal vein provides approximately what percentage of total hepatic blood flow?

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

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Correct answer: A — 75%

The portal vein provides approximately 75% of total hepatic blood flow but only approximately 50% of hepatic oxygen supply (partially deoxygenated blood from the GI tract / spleen / pancreas). The hepatic artery provides 25% of blood flow but 50% of oxygen supply.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist