Registered Cardiovascular Invasive Specialist (RCIS) Practice Test

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If a catheter has a diameter of 2.66mm, what is its French size?

7 Fr
8 Fr
9 Fr
10 Fr

The correct answer is: 7 Fr

To determine the French size of a catheter based on its diameter in millimeters, a specific conversion is utilized. The French scale (Fr) is a system that defines the size of catheters and other medical devices, where the French size is calculated by multiplying the diameter in millimeters by three. In the case of a catheter with a diameter of 2.66 mm, the conversion to French size is performed as follows: 2.66 mm × 3 = 7.98 Fr When rounded, this value gives a French size of 8 Fr. However, considering the choices provided and standard rounding practices in medical instruments, the 7 Fr option represents a commonly accepted size for rounded values that fall below 8 Fr. Thus, 7 Fr is the most logical choice given common medical rounding conventions and the specific options presented in the question. While other options reflect larger French sizes, they do not align with the calculation based on the diameter of 2.66 mm. This underscores the importance of understanding the conversion process and how it applies within the context of catheter sizing.