Foley Catheter Balloon Size
A 14 French Foley catheter typically has a balloon capacity of 5 mL, though some models may accommodate up to 10 mL depending on the manufacturer's specifications.
Standard Balloon Specifications
The balloon size for urinary catheters is not directly determined by the French (Fr) size of the catheter shaft itself, but rather by the manufacturer's design specifications for that particular catheter model. However, standard conventions exist:
- Most 14 Fr Foley catheters have a 5 mL balloon capacity, which is the typical size for standard adult urinary drainage catheters 1
- Some 14 Fr catheters may be designed with a 10 mL balloon capacity, particularly those intended for specific clinical applications 2, 3
- The balloon should be inflated with the manufacturer's recommended volume—typically marked on the catheter itself—to ensure proper function and minimize complications 1
Balloon Inflation Characteristics
- Latex catheters (14 Fr) have been shown to tolerate average burst volumes of approximately 83 mL before spontaneous rupture, though this far exceeds recommended fill volumes 1
- Silicone catheters (14 Fr) have lower burst volumes, averaging around 57 mL, but do not produce free fragments upon rupture 1
- At normal recommended fill volumes, the balloon functions safely without risk of fragment formation 1
Clinical Considerations
- Either sterile water or normal saline can be used to inflate the balloon without significant difference in deflation failure rates (9.2% vs 8.0%, respectively, P = 0.162) 2
- The balloon volume should be checked and confirmed according to the manufacturer's specifications printed on the catheter packaging or shaft 1
- Overinflation beyond recommended volumes increases risk of complications, while underinflation may result in inadequate retention 3
Important caveat: Always verify the specific balloon capacity marked on your catheter, as it varies by manufacturer and intended use, rather than assuming based solely on the French size.