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Catheters come in different shapes and sizes.   The size of the catheter will differ depending on your specific needs and requirements.

The diameter of a catheter is measured in “French Units” or “Fr”.  A single French Unit (1 FR) is 0.33mm.

1 FR = 0.33mm = .013” (or 1/77”)

Here is a sizing scale measuring the outside diameter for catheters in French Units:

FR 12 14 16 18 20 22 24 26 28
mm 4 4.7 5.3 6 6.7 7.4 8 8.7 9.4
inch 0.16 0.185 0.21 0.24 0.265 0.295 0.32 0.345 0.375


FR 30 32 34 36 38 40 42 48
mm 10 10.7 11.3 12 12.7 13.4 14 16
inch 0.4 0.425 0.455 0.48 0.5 0.53 0.55 0.64

Foley Catheters also have a measurement for their balloon capacity.  This measurement is in cubic centimeters and translates directly into milliliters.

1 CC = 1 mL



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