ISO 5356-1 15/22 mm Connectors — FRCA Primary MCQ

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

HardPhysics & Clinical MeasurementISO 5356-1 15/22 mm ConnectorsFRCA Primary

The standard 15 mm / 22 mm connectors on breathing circuits are specified by which international standard?

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

Reveal the answer and explanation

Correct answer: C — ISO 5356-1

ISO 5356-1 specifies conical connector dimensions for breathing system components. The 15 mm male connector fits inside a 22 mm female connector. This standardisation ensures interchangeability between manufacturers. The 15/22 mm system applies to endotracheal tube connectors / breathing circuit connectors / catheter mounts and airway devices.

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment