Minimum O2 Flow 200 mL/min — FRCA Primary MCQ

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ModeratePhysics & Clinical MeasurementMinimum O2 Flow 200 mL/minFRCA Primary

The minimum flow rate for oxygen on an anaesthetic machine is set at:

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Correct answer: D — 200 mL/min

Most modern anaesthetic machines have a minimum obligatory oxygen flow of approximately 200 mL/min (or 200-250 mL/min depending on manufacturer). This safety feature ensures that even if no gases are deliberately selected some oxygen always flows to the common gas outlet reducing the risk of delivering a hypoxic mixture.

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment