If you're new to intermittent self-catheterization (ISC), the terminology can be confusing — French sizes, coudé tips, hydrophilic coatings. This plain-language guide explains what each term means and how to choose, alongside your healthcare provider's guidance.
What Do French Sizes Mean?
Catheter diameter is measured in French (FR) units — 1 FR = 1/3 mm. Common adult sizes:
- 8–10 FR — pediatric or narrow urethra
- 12–14 FR — most common adult starting sizes
- 16–18 FR — larger diameter, sometimes needed for viscous urine or bypassing strictures
Your urologist or continence nurse determines the right size — using too small a catheter can cause leakage around it, while too large causes discomfort.
Straight Tip vs Coudé Tip
Straight tips are standard. Coudé (curved) tips are designed to navigate past obstructions like an enlarged prostate — commonly prescribed for men with BPH. Products like the GentleCath Intermittent Catheter for Males come in both tip styles and multiple FR sizes.
Male vs Female Length
Male catheters are typically 16" (40 cm); female catheters are 6–8" (15–20 cm), reflecting anatomical differences. Using the correct length makes the process faster and more comfortable.
Uncoated vs Hydrophilic
Uncoated catheters require separate lubricating jelly and are the most economical. Hydrophilic-coated catheters activate with water for a low-friction insertion — often preferred for sensitive urethras or frequent cathing.
How Many Catheters Per Day?
Most ISC users catheterize 4–6 times daily. Single-use is the standard of care in Canada — reusing catheters increases UTI risk significantly.
FAQ
Does intermittent catheterization hurt?
With correct technique and lubrication, it should be no more than briefly uncomfortable. Persistent pain warrants a call to your care team.
Are catheters covered by insurance in Canada?
Many provincial assistive-device programs and private plans cover intermittent catheters with a prescription. We provide detailed receipts for claims.
Shop catheters, drainage bags, and accessories in our Urology Supplies collection — discreet packaging, fast Canadian shipping.