How to Flush a Urinary Catheter Safely

Flushing a urinary catheter means gently pushing sterile salt water through it to clear a blockage so urine can drain again. It is a fix for a problem, not a routine chore, because every time the system is opened, germs have a way in.1PubMed. Catheter-related urinary tract infection Done safely, flushing comes down to two habits: keep everything clean, and never use force.

What You Need Before You Start

Home flushing usually needs only a syringe of saline and alcohol wipes.2Gillette Children. Caring for Your Foley Catheter at Home (Short Term) Normal saline is sterile salt water at the same strength as your body’s own fluids, and it is sold for this use. Plain or distilled water can upset the body’s salt balance when used for irrigation, at least in people with kidney failure.3PubMed Central. Is normal saline the best irrigation fluid to be used during percutaneous nephrolithotomy in renal failure patient? A prospective randomized controlled trial So use only the sterile saline your care team supplies, not tap water.

Saline should be at room temperature, never cold.4Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training If yours is stored in the refrigerator, let it sit out until it loses the chill. Don’t microwave it, because it heats unevenly and can leave hot spots.

Wash your hands with soap and water, or use alcohol hand sanitizer, before touching anything.5Memorial Sloan Kettering Cancer Center. How to Irrigate Your Urinary (Foley) Catheter Then clear a table and wipe it down before you lay out your supplies. Open the wipes and the syringe packaging only when you are ready to use them. Put a towel or tray under the connection to catch drips, and keep the clean end of a drainage bag within reach so the system stays open only briefly. Avoid touching the ends of the catheter, the drainage bag tube, or the syringe tip.6Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training

Step-by-Step How to Flush the Catheter

Some catheters have a sampling port, so you don’t have to break the bag connection at all. Disconnecting the bag opens the system wider, so it calls for extra wipes. Follow whichever method your nurse showed you for your setup.

“Slowly” means taking several seconds to empty a syringe, not one quick push. Steady, light pressure with your thumb is enough. If you feel resistance building, pause.

You may feel an odd or uncomfortable sensation during a flush, but it should not hurt.14Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training A mild feeling of fullness or a slight urge to pass urine as the saline goes in is expected and fades within moments. Sharp or burning pain is different. Pain is a signal to stop, not to push through. Never jerk or pull on the catheter tubing while you work.15Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training

Once the bag is reconnected, watch the tubing for the next several minutes. Urine moving into the bag is the sign the flush worked. If nothing has started draining after a few minutes, don’t repeat the flush straight away. Wash your hands again when everything is tidy.

How Much Saline to Use

If your team wrote down a number, it overrides these general figures. Ask whether that amount is per syringe or the total for the flush.

When blood clots block the catheter, clinic washouts may use 60 to 120 mL.21Keck Medicine of USC Urology. Hematuria Catheter Irrigation Procedure Don’t scale up on your own. Large or repeated washouts belong to your care team.

More isn’t better. Each extra syringe is another chance for germs to enter, and overfilling the bladder can cause cramping and leaking around the catheter.

If your instructions call for more than one syringe, finish the first and check how it went before drawing up the next, rather than loading several at once. Use a fresh syringe for each round if your nurse taught you to. Stop at the total your team gave you, even if urine hasn’t started flowing, and call rather than adding extra.

When Saline Won’t Go In or Won’t Come Back

Never force fluid into the catheter.22Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training If you feel resistance, pull back gently on the plunger and try pushing once more.23Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training If the resistance continues, stop and contact your nurse or care team.24Hospice of Cincinnati. Flushing Urinary Catheters: Patient/Caregiver Training

If saline won’t come back when you pull gently, don’t suck hard. Let urine drain by itself.25Royal Children’s Hospital (RCH). Urinary Catheterisation Clinical Guideline Forceful pulling can damage the bladder lining and hurt.26Manchester University NHS Foundation Trust. Flushing of an Indwelling Catheter & Bladder Washouts Reconnect the drainage bag, get up and walk around, and watch whether urine starts to flow.27Memorial Sloan Kettering Cancer Center. How to Flush a Urinary Catheter Safely Clinicians can check whether the catheter is open and draining, and if it isn’t, they change the catheter.28North Bristol NHS Trust. Catheter Troubleshooting

Before deciding the catheter is blocked, run through the simple checks. Look for kinks or twists in the tubing. Make sure the bag hangs below bladder level. Check that you didn’t leave the tubing pinched, and that the bag isn’t full.

A blocked catheter is different from a slow one. Urine that drips slowly but steadily is not the same as no urine at all. A slow flow may just mean low fluid intake or a kink, so check those first. A blockage is more likely when drainage stops completely and you also feel pressure or fullness in the lower belly.

When you call, tell the nurse when urine last drained and roughly how much. Say whether the saline went in and whether any came back. Mention any pain, swelling, fever, or leaking around the catheter.

When to Stop and Get Help

If the flush causes pain, stop and get advice.29Manchester University NHS Foundation Trust. Flushing of an Indwelling Catheter & Bladder Washouts Significant blood in the urine along with clots needs assessment by your care team, not home flushing.30North Bristol NHS Trust. Catheter Troubleshooting NBT Guide 2019 Pink-tinged urine can follow catheter changes, but bright red urine or clots that keep coming need prompt review.

If the catheter gets disconnected, leaks, or cleanliness is broken, guidance is to replace the catheter and bag with sterile equipment.31Centers for Disease Control and Prevention. Guideline for Prevention of Catheter-Associated Urinary Tract Infections So tell your care team if the ends touched something dirty or the bag came apart.

Some signs point to a blocked bladder that needs urgent attention: a full, painful lower belly with no urine draining, urine leaking around the catheter instead of into the bag, or fever, chills, or confusion, which can signal infection. If these come on strongly, call 911 or go to an emergency department rather than wait.

A blocked catheter becomes urgent because the bladder keeps filling with urine and can be damaged. A blockage you can’t fix within a short time should be reported the same day, not left overnight.

Should You Flush Routinely

Keeping the catheter and bag sealed as one closed system is a key way to prevent infection.32CDC. Clinical Safety: Preventing Catheter-associated Urinary Tract Infections (CAUTIs) Routine flushing does not prevent infection and may increase the risk.33PubMed. Catheter-related urinary tract infection Unless a blockage is expected, as with bleeding after prostate or bladder surgery, routine irrigation is not recommended.34CDC. Guideline for Prevention of Catheter-Associated Urinary Tract Infections (2009) Routine flushing with antibiotic solutions isn’t recommended either.35CDC. Guideline for Prevention of Catheter-Associated Urinary Tract Infections (2009) Even careful technique can’t remove the risk of germs getting in, so avoiding unneeded flushes beats perfecting the technique.

There are exceptions. Some people, such as those with a surgically rebuilt bladder, make mucus or debris and need regular flushes they can learn to do themselves.36North Bristol NHS Trust. Catheter Troubleshooting NBT Guide 2019 After some surgeries, hospitals run saline in continuously and watch the outflow for bleeding.37Multiphze. What are the differences between Continuous Bladder Irrigation (CBI) and Manual Bladder Irrigation? A hand flush, by contrast, is a one-off to clear a blockage.38Multiphze. What are the differences between Continuous Bladder Irrigation (CBI) and Manual Bladder Irrigation?

Your instructions will name a schedule if you are in the regular-flushing group. Without one, flush only when you suspect a blockage. At discharge, ask whether flushing is as-needed or scheduled.

Why Catheters Block and How to Prevent It

Blood clots and mucus are common causes of short-term blockage.39Royal Children’s Hospital (RCH). Urinary Catheterisation Clinical Guideline In long-term catheters, a germ called Proteus mirabilis is the main cause of the crusty mineral build-up that blocks them.40Spinal Cord. The encrustation and blockage of long-term indwelling bladder catheters: a way forward in prevention and control It makes urine alkaline, so minerals crystallise on the catheter.41Spinal Cord. The encrustation and blockage of long-term indwelling bladder catheters: a way forward in prevention and control The germ can also settle in bladder stones and keep causing repeat blockages.42Spinal Cord. The encrustation and blockage of long-term indwelling bladder catheters: a way forward in prevention and control So a person can keep re-forming crust even after the catheter is changed.

The type of blockage changes the answer. A clot or mucus may clear with a gentle flush, but mineral crust is hard and usually won’t. Repeated flushes for a catheter that blocks again and again are unlikely to help and call for a different plan. Telling your team what the blockage looked like helps them work out which type you have. Signs of crust include gritty, sandy material in the tubing or on a removed catheter, and blockages that recur around the same interval.

Drinking enough fluid is essential for keeping a catheter flowing.43PubMed. Blocked urinary catheters: can they be better managed? Spread it through the day unless you’re on a fluid limit. For people who block often, planned catheter changes before blockage are often the best approach.44PubMed. Blocked urinary catheters: can they be better managed?

Saline does little to dissolve mineral crust in the lab.45PubMed. Experimental investigations on dissolution of incrustations on the surface of catheters Acidic citrate solutions dissolved about 70% of the crust in the lab.46PubMed. In vitro investigations into the formation and dissolution of infection-induced catheter encrustations But there’s no good evidence they keep catheters open long-term in people, so they’re used only case by case.47PubMed. Preventing blockage of long-term indwelling catheters in adults: are citric acid solutions effective?

Flushing a Child’s Catheter

Children’s instructions often start with 10 mL of saline or the amount the doctor directs.48Children’s Minnesota. _EducationMaterialsFrame If saline won’t come back, gently put 10 mL back in once more and let it drain on its own.49Royal Children’s Hospital (RCH). Urinary Catheterisation Clinical Guideline

A child’s amount depends on age and size, so use the number written for your child, not the general 10 mL. Ask the doctor whether the flush is meant for blockages only or is part of a scheduled routine. If your child has had bladder surgery, ask for a written plan, since their needs may differ from standard guidance.

Explain each step in simple words beforehand. A second adult can hold and comfort the child if needed. Stop if the child reports real pain rather than an odd feeling.