# What does French mean in catheters?

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“French size” is a scale used to identify the outer diameter of a catheter. French scale units are obtained by multiplying the outer diameter of the catheter in mm by 3. Likewise, multiplying the French size by 0.33 will give the outer diameter of the catheter in mm.

## Why is a catheter measured in French?

Why Is the French Scale Used for Catheter Sizes? The French Scale makes it easy to size things that are extremely small in diameter. Catheters are just millimeters wide, with different sizes often being just fractions of a millimeter apart.

## What is bigger 14 FR or 16 FR?

14 Fr. 4.7 mm 0.185 in. 16 Fr. … 6 mm 0.24 in.

## What size French is larger?

The universal gauge used for determining this number is known as the “French size”. The higher the number the larger the diameter. To determine the size of a urinary catheter, simply multiply the diameter length in millimeters by 3. For example, if the catheter has a diameter of 4.7 mm, it will have an FR size of 14.

## What is the French measurement for catheters?

The French size of a catheter is determined by a simple multiplication of 3 (diameters in millimeters multiplied by 3 = the French size). For example, if a catheter has a diameter of 4.7 millimeters, then the French (Fr) size is 14.

## What does 5 French mean?

5 Fr is 1.67 mm and 5.24 mm. 6 Fr is 2 mm and 6.28 mm. 7 Fr is 2.33 mm and​ 7.33 mm.

## What is the average catheter size for males?

The average catheter size used by adult men is between 14FR to 16FR. Most men use 14FR catheters. The average catheter size used by adult women ranges from 10FR to 12FR. Most women use 12FR catheters.

## What is the biggest Foley catheter?

They vary in size between 12 Fr (4 mm) and 30 Fr (10 mm). Size 12 Fr is large enough to relieve urinary obstruction in most adults, although practitioners typically choose size 14 to 16 Fr for initial catheterization. Larger diameter catheters may be required for adequate drainage of hematuria or clots.

## How far do you insert a male catheter?

Encourage your patient to breathe deeply as you gently insert the catheter tip into the meatus. Advance it 7 to 9 inches (17.5 to 22.5 cm) or until urine starts draining, then advance it another inch (2.5 cm). If you meet any resistance, rotate or withdraw the catheter slightly.

## What size foley catheter is smallest?

Foley Catheter Sizes

The relative size of a Foley catheter is described using French units (Fr). In general, urinary catheters range in size from 8Fr to 36Fr in diameter. 1 Fr is equivalent to 0.33 mm = . 013″ = 1/77″ in diameter.

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## What gauge is a 4 French catheter?

As opposed to the “Birmingham Gauge” used for hypodermic needle tubing, French catheter sizes increase in diameter as their numerical designation increases.

French Catheter Gauge Size Decimal and Metric Equivalents.

Gauge Dia. in mm Dia. in Inches
4 1.33 0.053″
5 1.67 0.066″
6 2 0.079″
7 2.3 0.092″

## What is a French size 38?

Dresses, jackets, coats and blouses

S-M-L USA France
S 2 34
S 4 36
M 6 38
M 8 40

## How long is a female catheter?

Female length catheters range from 6-8 inches in length. Women may prefer to use male length catheters if they like a longer catheter type. Pediatric length catheters typically range from 10-12 inches in length. Women and children generally use shorter catheters because of their shorter urethral length.

## How many cc is a foley balloon?

Inflate the catheter balloon with sterile water (usually 10 cc).

## How many millimeters is 1 French?

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.