The sizes of urologic endoscopes are measured in what scale?
a. French
b. Gauge
c. Inches
d. Yards
ANS: A
The sizes of these instruments are measured on the French (Fr) scale, the diameter in millimeters (mm) multiplied by three. The smallest ureteral catheter is 1 mm in diameter, or 3 Fr; the largest is 14 Fr.
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