Answer: All internal catheters, including Foleys and intermittent styles, are sized by a universal gauge system which is referred to as a “French size.” This is based upon the measure of the external diameter of the tube.
The way the size is determined is a simple multiplication of 3 (diameters in millimeters multiplied by 3 = the French size). So, if a catheter has a diameter of 4.7 millimeters, the French (Fr) size is 14.
To determine the right size of the catheter for your individual needs, please be sure to consult with your prescribing healthcare professional, so that you can get a hassle-free experience with your intermittent catheters every time.
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