The French scale or French gauge system (most correctly abbreviated as Fr, but also often abbreviated as FR or F) is commonly used to measure the size (diameter) of a catheter. 1 Fr = 0.33 mm, and therefore the diameter of the catheter in millimeters can be determined by dividing the French size by 3:
D (mm) = Fr/3
or
Fr = D (mm) × 3
For example, if the French size is 9, the diameter is 3 mm.
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