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French catheter scale chart



The French catheter scale or "French units" (F) is commonly used to measure the outside diameter of needles, catheters, and other cylindrical medical instruments.

1 F is equivalent to 0.33 mm = .013" = 1/77" of diameter. Thus the size in French units is roughly equal to the circumference of the catheter in millimetres.

French
Gauge 		Diameter
(mm) 		Diameter
(inches)
3 1 0.039
4 1.35 0.053
5 1.67 0.066
6 2 0.079
7 2.3 0.092
8 2.7 0.105
9 3 0.118
10 3.3 0.131
11 3.7 0.144
12 4 0.158
13 4.3 0.170
14 4.7 0.184
15 5 0.197
16 5.3 0.210
17 5.7 0.223
18 6 0.236
19 6.3 0.249
20 6.7 0.263
22 7.3 0.288
24 8 0.315
26 8.7 0.341
28 9.3 0.367
30 10 0.393
32 10.7 0.419
34 11.3 0.445

References

This chart taken from Texloc

See also
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "French_catheter_scale_chart". A list of authors is available in Wikipedia.
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