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.
Choose the smallest catheter that will allow adequate urinary drainage. Size 12–14F is usually adequate for males and females. Use size 16–20F if the patient has urine with debris, mucous, blood clots or haematuria, which may occlude smaller lumens.
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