⚠️

Only attempt this after hands-on, in-person training from your urology team — never from a website alone. This page is a refresher for people who have already been trained, not a substitute for that training. Changing an SP catheter is usually straightforward once the tract is well established (typically after the first few changes and at least 4–6 weeks post-surgery), but it carries real risks: the catheter can be placed into a false passage, and if it comes out and you can't get it back in, the opening can start to close within an hour. Have your urologist or SCI nurse teach you in person, always keep a spare catheter, and have a backup plan before you ever do this alone.

A suprapubic (SP) catheter drains your bladder through a small opening in the lower abdomen rather than through the urethra. It has to be changed regularly — and for many people with SCI, learning to do it themselves, more often than the standard schedule, is one of the biggest things that cuts down on urinary tract infections.

Why Do It Yourself

If you rely on a clinic or home-health nurse, you're locked into their schedule and their availability. Learning to change your own catheter gives you three things: control over timing (you can change on the schedule that keeps you healthiest, not the calendar that's convenient for the office), independence (no waiting around for an appointment when the catheter is bothering you), and — for many people — fewer infections, because you can change it before biofilm and encrustation build up.

Over time, bacteria form a slimy biofilm on the catheter surface and mineral deposits (encrustation) accumulate. The longer a catheter stays in, the more of this builds up — and that biofilm is a constant source of the bacteria that cause UTIs. A fresh catheter starts that clock over.

The Schedule Gap: Weekly vs. Monthly

Standard medical guidance is to change a long-term SP catheter roughly every 4 to 6 weeks, and that's usually what insurance will supply and what a urology office will schedule. But "every 4–6 weeks" is a general default, not a personalized prescription — and for people prone to recurrent UTIs, that interval can be too long.

💡

A lived-experience tip that's worth raising with your urologist: changing the catheter weekly — rather than every 3–4 weeks — has been, for many people with SCI, the single most effective change for preventing recurrent UTIs. A newer catheter means less biofilm and encrustation for bacteria to live on. The catch is supplies: insurance often only covers a monthly change, so you may need your urologist to document recurrent UTIs and write a prescription for more frequent changes and extra catheters. The evidence for an exact interval is individual, so work this out with your provider — but it's a conversation a lot of people wish they'd had sooner.

What You Need

The supply list is short. Once you've done it a few times you can lay everything out in a couple of minutes:

A new Foley catheter — the same type, French (Fr) size, and balloon size your urologist prescribed. (Don't change size on your own.)
Povidone-iodine swabs or swabsticks to clean around the stoma. (If you have an iodine allergy, your provider will give you an alternative antiseptic.)
A 10 mL syringe to deflate the old balloon and inflate the new one. Some come prefilled with saline, which is convenient. Note on balloon fluid: most catheter manufacturers specify sterile water for the balloon, because saline can crystallize over weeks and make the balloon hard to deflate at the next change. Saline is still commonly used in practice — follow your urologist's instruction and your catheter's package directions.
Sterile lubricant (lubricating jelly) for the new catheter.
Clean gloves (sterile if your team advises), plus a towel or absorbent pad.
Your drainage bag or leg bag ready to connect.
At least one spare catheter within reach, in case the first one is faulty or you have trouble.

Before Your First Self-Change

Wait until the tract is mature. The first SP catheter change after surgery is done by the urologist, and the tract needs several weeks (commonly 4–6) and a few professional changes before it's safe to do yourself.
Get taught in person. Have your urologist, urology nurse, or SCI clinic watch you do it at least once and sign off.
Know your numbers. Your catheter's Fr size and the exact balloon volume (it's printed on the catheter funnel — often 10 mL).
Have a backup plan. Know who to call and which ER to go to if the catheter won't reinsert.

Step by Step

This is the general sequence. Use it alongside — not instead of — the technique your own clinician taught you.

Wash your hands thoroughly and set up a clean surface. Open your supplies so everything is within reach. Put on your gloves.
Pre-lubricate the new catheter and have it ready, plus your syringe for inflating the new balloon.
Deflate the old balloon. Attach the empty syringe to the balloon inflation valve (the small colored port). Let the water push the plunger back on its own, or withdraw gently until the balloon is fully deflated. Note the volume that comes out. Never cut the valve to deflate it.
Remove the old catheter. Gently and steadily withdraw it through the stoma. Mild resistance or a little discomfort is normal; a few drops of blood can happen.
Clean the stoma. Use the iodine swabs to clean around the opening, working in circles from the center outward.
Insert the new catheter into the tract to roughly the same depth the old one sat — usually most of its length, to about the catheter's Y-branch. It should slide along the established tract without force. Don't force it if it won't pass (see below).
Confirm it's in the bladder before inflating. You should see urine drain back. Do not inflate the balloon until you see urine return — inflating it in the tract instead of the bladder is painful and can cause injury. If no urine comes and you're unsure, do not inflate; get help.
Inflate the new balloon with the prescribed volume of sterile water (or per your provider's instruction).
Seat and secure. Gently pull back until the balloon rests against the bladder wall, connect your drainage bag, and secure the catheter so it isn't tugged. Tape or a securement device prevents traction on the stoma.
Dispose of the old catheter and supplies, and wash your hands.

If It Won't Go Back In

🚨

This is the one real emergency. If the catheter slips out or you can't get the new one in, the stoma can begin closing within about an hour. Don't force a catheter against resistance — that risks creating a false passage. Try promptly with a fresh (and, if needed, slightly smaller) catheter if you've been trained to. If it still won't pass, go to the nearest emergency department right away and tell them you have a suprapubic catheter that has come out and needs replacing — say it's time-sensitive because the tract closes quickly. The longer you wait, the more likely you'll need a new tract placed surgically.

This is exactly why you keep a spare catheter with you everywhere — at home, in the car, in your travel bag — and why you never let hours pass with the catheter out.

Afterward & What's Normal

Normal: a small amount of blood or pink-tinged urine right after a change, mild soreness at the stoma, and a brief sense of bladder spasm that settles. Urine should be draining freely within moments.

Call your provider or seek care if you have: no urine draining at all, severe or worsening pain, heavy or persistent bleeding, fever or chills, signs of autonomic dysreflexia (pounding headache, sweating, spike in blood pressure — a medical emergency for T6-and-above injuries), or the catheter leaking heavily around the stoma. Flushing the catheter as your team directs, and keeping it secured, helps it keep draining between changes.

What Nobody Tells You

The change interval is negotiable. "Every 4 weeks" is a default, not a law. If you keep getting UTIs, more frequent changes (many people do weekly) can be a game-changer — but you'll likely have to ask your urologist to prescribe the extra supplies.
Sterile water vs. saline for the balloon matters at the next change. Saline can crystallize and make the balloon stubborn to deflate weeks later. If you've ever had a balloon that wouldn't deflate, this is often why.
See urine before you inflate. The most important safety habit in the whole process — it confirms you're in the bladder, not a false passage.
Spares everywhere. The tract closing fast is the real danger of SP catheters. A spare catheter in every bag turns a 3 a.m. emergency into a minor inconvenience.
It gets easy. The first few feel intimidating; within a handful of changes most people can do it in a few minutes without thinking twice.

Sources & Further Reading

This page combines lived SCI experience with published clinical guidance, including:

Bladder Management Following Spinal Cord Injury — Consortium for Spinal Cord Medicine Clinical Practice Guidelines (Paralyzed Veterans of America)
Bladder Management Options Following SCI — Model Systems Knowledge Translation Center (MSKTC)
Urinary catheters (incl. suprapubic) — NHS

SCI.help articles are information, not medical advice. Practice varies by injury level, provider, and institution — always confirm specifics with your own care team.

Got a self-change tip that helped you?

The practical tricks — what supplies, what schedule, what made it easier — are exactly what the next person needs. Share what you've learned.

Join the Community Forum →

Educational information based on urology guidance and lived experience. Not medical advice — learn and confirm technique with your own urology team. · Last reviewed June 2026

How to Change a Suprapubic Catheter Yourself