What is the diameter in millimeters of a 5F sheath?

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Multiple Choice

What is the diameter in millimeters of a 5F sheath?

Explanation:
French size is a gauge for the outer diameter of catheters and sheaths. The conversion is diameter in millimeters equals French size divided by 3 (1 Fr ≈ 0.333 mm). Therefore, a 5F sheath has an outer diameter of 5/3 = 1.666... mm, typically rounded to 1.67 mm. This fits the pattern that 4F ≈ 1.33 mm, 6F ≈ 2.0 mm, and 7F ≈ 2.33 mm.

French size is a gauge for the outer diameter of catheters and sheaths. The conversion is diameter in millimeters equals French size divided by 3 (1 Fr ≈ 0.333 mm). Therefore, a 5F sheath has an outer diameter of 5/3 = 1.666... mm, typically rounded to 1.67 mm. This fits the pattern that 4F ≈ 1.33 mm, 6F ≈ 2.0 mm, and 7F ≈ 2.33 mm.

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