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While an 18-gauge, or a catheter measuring 0.234 inches (about 5.94 mm), used to be the standard, the development of short peripheral catheters with smaller but stronger walls made it possible to use a smaller size for a larger fluid flow.
What size catheter should I get? Internal catheters usually have their outside diameters measured in French sizes. 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.