Catheter sizing confuses many buyers. Here's what 'Fr' means and how to choose.
What does 'Fr' mean?
French (Fr or CH) measures the catheter's outer circumference — higher numbers are wider. Each Fr is about 0.33 mm in diameter.
14Fr vs 16Fr
14Fr is a common adult size for routine drainage; 16Fr gives greater flow where output is higher. Use the smallest size that drains adequately for comfort.
Balloon volume
Indwelling Foley catheters have a retention balloon inflated with sterile water per the labelling — confirm the volume on the packaging at point of use.
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Frequently asked questions
Is a bigger catheter better?
No — use the smallest size that drains adequately to maximise comfort and reduce irritation.
What balloon volume do I use?
Follow the volume printed on the device packaging; do not over- or under-inflate.
