What is the diameter in millimeters of a 7F sheath?

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Multiple Choice

What is the diameter in millimeters of a 7F sheath?

Explanation:
Sizing with French units uses the rule that outer diameter in millimeters equals the French size divided by 3. So a 7F sheath has an outer diameter of 7/3 mm, which is about 2.333 mm. Rounding to two decimals gives 2.33 mm. This value reflects the external diameter of the sheath; the lumen is smaller due to wall thickness.

Sizing with French units uses the rule that outer diameter in millimeters equals the French size divided by 3. So a 7F sheath has an outer diameter of 7/3 mm, which is about 2.333 mm. Rounding to two decimals gives 2.33 mm. This value reflects the external diameter of the sheath; the lumen is smaller due to wall thickness.

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