French catheter scale

(Redirected from French catheter scale chart)
Jump to navigation Jump to search

WikiDoc Resources for French catheter scale

Articles

Most recent articles on French catheter scale

Most cited articles on French catheter scale

Review articles on French catheter scale

Articles on French catheter scale in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on French catheter scale

Images of French catheter scale

Photos of French catheter scale

Podcasts & MP3s on French catheter scale

Videos on French catheter scale

Evidence Based Medicine

Cochrane Collaboration on French catheter scale

Bandolier on French catheter scale

TRIP on French catheter scale

Clinical Trials

Ongoing Trials on French catheter scale at Clinical Trials.gov

Trial results on French catheter scale

Clinical Trials on French catheter scale at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on French catheter scale

NICE Guidance on French catheter scale

NHS PRODIGY Guidance

FDA on French catheter scale

CDC on French catheter scale

Books

Books on French catheter scale

News

French catheter scale in the news

Be alerted to news on French catheter scale

News trends on French catheter scale

Commentary

Blogs on French catheter scale

Definitions

Definitions of French catheter scale

Patient Resources / Community

Patient resources on French catheter scale

Discussion groups on French catheter scale

Patient Handouts on French catheter scale

Directions to Hospitals Treating French catheter scale

Risk calculators and risk factors for French catheter scale

Healthcare Provider Resources

Symptoms of French catheter scale

Causes & Risk Factors for French catheter scale

Diagnostic studies for French catheter scale

Treatment of French catheter scale

Continuing Medical Education (CME)

CME Programs on French catheter scale

International

French catheter scale en Espanol

French catheter scale en Francais

Business

French catheter scale in the Marketplace

Patents on French catheter scale

Experimental / Informatics

List of terms related to French catheter scale

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Ch, F, Fr, FR

Overview

The French catheter scale (most correctly abbreviated as Fr, but also often abbreviated as FR or F) is commonly used to measure the outer circumference of cylindrical medical instruments including catheters. In the French Gauge system as it is also known, the diameter in millimeters of the catheter can be determined by dividing the French size by 3, thus an increasing French size corresponds with a larger diameter catheter. The following equations summarize the relationships:

D(mm) = Fr/3

or

Fr = D(mm)*3

For example, if the French size is 9, the diameter is 3 mm.

Note: the French scale is equal to the diameter in mm multiplied by three, not the circumference (diameter times π) as is sometimes thought.

This is contrary to needle-gauge size, where the diameter is 1/gauge inches; thus the larger the gauge needle, the more narrow the bore of the needle.

The Stubs Iron Wire Gauge system is also commonly used in a medical setting and is in fact more common for measuring needles, even though many find the Stubs system to be more confusing because the scale is non-linear and inversely proportional.

Size Correspondence

1 Fr 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 millimeters.

Sizing scale of the French catheter system
French
Gauge
Diameter
(mm)
Diameter
(inches)
3 1.00 0.039
4 1.33 0.053
5 1.67 0.066
6 2.00 0.079
7 2.33 0.092
8 2.67 0.105
9 3.00 0.118
10 3.33 0.131
11 3.67 0.144
12 4.00 0.158
13 4.33 0.170
14 4.67 0.184
15 5.00 0.197
16 5.33 0.210
17 5.67 0.223
18 6.00 0.236
19 6.33 0.249
20 6.67 0.263
22 7.33 0.288
24 8.00 0.315
26 8.67 0.341
28 9.33 0.367
30 10.0 0.393
32 10.7 0.419
34 11.3 0.445

Historical Perspective

The French Gauge was devised by Joseph-Frédéric-Benoît Charrière, a 19th century Parisian maker of surgical instruments, who defined the "diameter times 3" relationship.

In some countries (especially French speaking), this unit is called Charriere and abbreviated as Ch.

References

This chart taken from Texloc

See also


Template:WikiDoc Sources