Catheter sizes
Intermittent catheter sizes are usually measured by what we call charriere (CH) sizes, this is based on the external diameter of the catheter tube. You may also see this commonly referred to as French (Fr) and you will be able to find these sizes on the catheter packaging. These sizes usually start at 6CH and go up to around 24CH.
To help determine which size catheter you’re using, often intermittent catheters will use a universal colour-coding system that has corresponding colours to charriere size. So, for example, an orange funnel indicates you’re using a 16CH catheter.
Male and female anatomies mean that you will require different length catheters based on your gender. The male urethra is longer than the female urethra. However, some women prefer a longer catheter. Your healthcare professional will decide the right size and length catheter for you. Typically, a male length catheter is 16 inches or 40cm whereas a female length catheter can range from 6-8 inches or 15-20cm. Paediatric sizes are usually between 6-12 inches or 15-30cm in length.
How do I know if I have the right size for me?
With the right Charriere size, your urine should flow from your bladder through the catheter at a steady pace and you should feel comfortable throughout the whole process.
If your catheter size is too small, you may experience spillage where the urine doesn’t flow down the tube.
If your catheter size is too big you will most likely feel discomfort, pain, and possibly minor bleeding where irritation occurs.
If you feel that either your catheter is too small or too big, you should speak with your healthcare professional, they will ensure you find an alternative size that better suits your needs. This should mean that you can comfortably self-catheterise with less risk of complications occurring.
How will my healthcare professional support me?
To make sure that you have the right size catheter for personal use, you and your healthcare professional will have many discussions to decide both the length and width of the intermittent catheter you are selecting. They will consider both your body and any medical needs that you may have to ensure you get the right fit.
We understand that self-catheterisation can feel daunting, especially if you’re new to the catheter world. Our in-house Vyne nursing team are more than happy to answer any questions you may have and give you the support you need to self-catheterise confidently, we’re only a phone call away…
Want to find out more about self-catheterisation? read our full ISC guide here.
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