Answer: The French catheter scale or ""French units"" (Fr) is commonly used to measure the outside diameter of needles as well as catheters. 1 ""French"" or ""Fr"" is equivalent to 0.33 mm = .013"" = 1/77"" of diameter. The size in French units is roughly equal to the circumference of the catheter in millimeters. We cannot help you in sizing. we suggest you to please consult with your physician about sizing.
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