French catheter scale chart

French catheter scale chart is a system used to measure the size of a catheter. It is based on the diameter of the catheter. Each French unit (Fr) is equivalent to 0.33 millimeters (mm).

Overview

The French catheter scale or French units is commonly used in medicine to measure the size of catheters, endotracheal tubes, and other cylindrical medical instruments. The scale is named after a Frenchman named Joseph-Frédéric-Benoît Charrière, a 19th-century Parisian producer of surgical instruments, who defined the diameter of a catheter in terms of French size.

Calculation

The diameter of a catheter in millimeters can be calculated by taking the French size and dividing by 3. For example, a catheter that is 9 Fr has a diameter of 3 mm.

Usage

The French catheter scale is used in a variety of medical procedures, including urinary catheterization, central venous catheterization, and endotracheal intubation. It is also used in the sizing of stents, nephrostomy tubes, and drainage catheters.

See also

• Catheter
• Endotracheal tube
• Stent
• Nephrostomy

References

French catheter scale chart Resources
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