The largest size urinary catheter is 36Fr.
According to the information provided, urinary catheters generally range in size from 8Fr to 36Fr. The "Fr" stands for French gauge, a unit of measure for catheter diameter.
Understanding Catheter Sizes
Here's a breakdown of what the French gauge (Fr) means:
- Fr to mm conversion: 1 Fr is equivalent to 0.33 mm.
- Fr to inches conversion: 1 Fr is approximately equal to 0.013 inches or 1/77 of an inch in diameter.
- The cross-sectional diameter of a urinary catheter is equal to three times the diameter. This is not related to the Fr size directly, but rather to the measurement of the central opening of the catheter, which is important for flow rate.
Therefore, a 36Fr catheter would have a diameter of approximately 12mm (36 x 0.33 mm).
