How to Change a Rectal Tube Collection Bag

Changing a rectal tube collection bag involves clamping the drainage tubing, disconnecting the full bag from the catheter hub, attaching a new bag, and releasing the clamp so drainage resumes. The exact steps vary depending on the specific fecal management system in use, but the core principles are consistent across devices: maintain a closed system to prevent contamination, protect the surrounding skin, and handle the connection points carefully to avoid dislodging the catheter. While the procedure itself takes only a few minutes, doing it well matters more than most people realize, because poor technique during bag changes is one of the main ways pathogens spread and skin breaks down around these devices.

What You Need Before You Start

Gather everything before you begin so you are not fumbling mid-procedure with a disconnected system. You will need a fresh collection bag compatible with your specific device, a clamp (many systems include one built into the tubing), clean gloves, an absorbent pad to place under the connection site, and skin-cleaning supplies. Having a small basin or plastic bag nearby for the used collection bag keeps things contained.

If you are working with a commercially available fecal management system, the replacement bags are usually device-specific. The connection ports between brands are not interchangeable, so confirm you have the correct bag before disconnecting anything. Most hospital supply rooms stock bags matched to whatever catheter system the unit uses, but in home-care settings you may need to order them through a medical supplier.

The General Procedure

The process follows a logical sequence designed to keep the system sealed as much as possible. Position the patient comfortably, ideally on their side with knees slightly bent, so you have clear access to the tubing and bag. Place an absorbent pad underneath the connection area between the catheter tubing and the bag. This matters: research comparing fecal management devices found that contamination of pads placed under the device during daily changes ranged dramatically depending on technique and device design, with some systems contaminating the pad in over a third of changes while others kept contamination to less than one percent.¹

Clamp the tubing above the bag connection. This prevents stool from flowing out during the swap. If your system has a built-in slide clamp, push it closed. If not, use a hemostat or similar clamp placed firmly on the tubing. Once clamped, disconnect the full bag at the hub or port where it meets the catheter tubing. This is typically a twist-lock or snap-fit connection. Set the full bag aside in your basin or disposal bag.

Before attaching the new bag, wipe the exposed end of the catheter tubing with an antiseptic wipe. This step is easy to skip when you are in a hurry, but it is one of the most effective things you can do to reduce contamination at the junction point. Connect the new bag, confirm the seal is secure by gently tugging, then release the clamp. Watch for a moment to make sure stool flows freely into the new bag and there are no kinks in the tubing.

How Often the Bag Needs Changing

Most manufacturers recommend emptying or changing the collection bag when it is about two-thirds full, or at least once per nursing shift in a hospital setting. In practice, the frequency depends on stool output. Patients with high-volume diarrhea, which is the most common reason these devices are placed, may need bag changes several times a day.² Some systems allow you to drain the bag through a bottom spout without disconnecting it from the tubing, which reduces how often you need to break the closed system. If your device has a drain spout, use it for routine emptying and save full bag replacements for when the bag itself is visibly soiled, damaged, or has been in place for the maximum time recommended by the manufacturer.

Data from an intensive care unit audit found that rectal tubes remained in place for a median of five days, with a range of one to 23 days, so bag changes are a recurring task throughout the device’s dwell time.³ The longer the tube stays in, the more bag changes you will perform, and each one is a moment where technique matters.

Why Infection Control During Bag Changes Is Critical

Every time you open the closed drainage system, you create an opportunity for pathogens to escape or be introduced. This is a particular concern when the patient has an infection like Clostridioides difficile, where the whole point of the fecal management system is to contain highly infectious stool. A comparative trial looking at two different fecal management devices found striking differences in contamination rates: one device had roughly 21 percent contamination on the bag’s outer surface during changes, while the other had contamination rates above 80 percent on the same surfaces.¹ The tubing and hub interface showed similarly large gaps between devices. The difference came down to system design and how the connection was handled during the swap.

What this means practically is that you should treat bag changes the way you would treat any procedure involving infectious material: wear gloves, minimize the time the system is open, clean connection points, and dispose of the used bag promptly. If the patient has a known enteric infection, gown and additional precautions may be warranted. The absorbent pad underneath serves as your safety net. Replace it after every bag change, even if it looks clean.

Protecting the Skin Around the Catheter

Incontinence-associated dermatitis, the red, raw, broken skin that develops when stool sits against the body, is one of the main reasons rectal tubes are placed in the first place. A meta-analysis of 12 randomized trials found that fecal collection devices significantly reduced this kind of skin breakdown in critically ill patients, with tube-based collection systems cutting the odds of dermatitis by roughly three-quarters compared to traditional pad-and-clean methods.⁴ But that protection only holds if the system stays intact. Leaks around the catheter, improperly seated bags, and sloppy bag changes that allow stool to contact perianal skin all undermine the device’s purpose.

During each bag change, take a moment to inspect the skin around the catheter insertion site. Look for redness, moisture, or any signs of breakdown. If you notice irritation, apply a barrier cream or skin protectant to the perianal area before reconnecting the new bag. Also check that the catheter itself has not shifted, because movement of the device within the rectum can cause pressure on the mucosal lining. Evidence supports that these devices reduce both dermatitis and pressure injuries when managed properly.⁵

Complications to Watch For

Bag changes are also your chance to spot problems before they become serious. The retention balloon that holds the catheter in place can cause pressure on the rectal wall, and over time this pressure can lead to ulcers or bleeding. A case report described a patient who developed a rectal ulcer with severe gastrointestinal bleeding, attributed to the pressure from the inflatable balloon and the buildup of stool above the catheter pressing on the bowel wall.⁶ Other potential complications include loss of anal sphincter tone, abdominal distention, and in rare cases bowel obstruction or perforation.

Another case documented massive rectal bleeding from a laceration in the rectal wall, likely caused by sudden movement of the device within the rectum or trauma during insertion, requiring transfusion and surgical intervention to stop the bleeding.⁷ While these severe events are uncommon, the ICU audit mentioned earlier recorded major adverse events in about three percent of patients with rectal tubes, which works out to roughly one event per 200 device-days.³

During bag changes, look for the following warning signs:

Blood in the bag: Fresh red blood in the drainage that was not there before could indicate a mucosal tear or ulceration.
Abdominal distention: If the patient’s abdomen looks more swollen than before, stool may be backing up above the catheter.
Catheter migration: The external portion of the tubing should remain at roughly the same length. If more tubing is visible outside the body, the device may be sliding out. If less is visible, it may have migrated inward.
No output: A completely empty bag over several hours in a patient who was previously having frequent stools could mean the tube is blocked or kinked.

Report any of these findings to the clinical team promptly. Do not attempt to reposition or reinflate the retention balloon yourself unless you have been specifically trained to do so.

Stool Consistency and What It Tells You

The character of the stool in the collection bag provides useful clinical information at every change. Many facilities use the Bristol Stool Scale, a simple visual chart, to grade stool consistency during assessment.⁸ Rectal tubes work best with liquid to semi-liquid stool. If you notice the stool becoming thicker or more formed during bag changes, that is actually a sign the patient may be improving and the tube might soon be removable. Conversely, if output becomes extremely watery and high-volume, it could indicate worsening diarrhea or an infectious process that needs medical attention.

Noting the color is worthwhile too. Dark, tarry stool suggests upper gastrointestinal bleeding, while bright red blood points to a source closer to the rectum, potentially the catheter itself. Greenish or unusually foul-smelling output can be associated with certain infections. You do not need to be a diagnostician to relay these observations, but tracking what you see at each bag change gives the care team a running picture of the patient’s condition.

Nursing Time and Resource Savings

One underappreciated reason to get bag changes right is the sheer amount of time and supplies involved in managing fecal incontinence. A Canadian budget analysis found that nursing time for managing incontinence dropped from nearly six hours per day for complex patients using traditional methods (pads, linens, repositioning, cleaning) to about four hours per day with a fecal management system.⁹ Material costs fell substantially too, with one hospital reporting daily savings of roughly $50 per average patient and over $300 per complex patient. Another study estimated total per-patient costs at under $1,120 with a fecal management device compared to $1,900 without one, driven largely by the cost of treating skin breakdown and pressure injuries that the device prevented.¹⁰

These numbers make the case that keeping the system running smoothly, which means competent bag changes done on time, is one of the more cost-effective things a care team does in the ICU. A sloppy bag change that leads to a leak, a skin tear, or a contamination event erases a good portion of those savings in a single incident.

Patient Dignity During the Procedure

Fecal incontinence is deeply distressing for patients who are aware of it. Even in the ICU, where patients may be sedated or critically ill, those who are conscious often experience significant embarrassment. Fecal management systems are recognized as playing an important role in preserving patient dignity by containing stool in a closed, less visible system rather than requiring repeated open cleaning and linen changes.¹¹

Bag changes are one of the moments when this dignity can be compromised. Minimize exposure by draping the patient, explaining what you are doing in simple terms if they are awake, and working efficiently. If visitors are present, ask them to step out briefly. A bag change done discreetly and quickly supports the emotional wellbeing that these systems are partly designed to protect. The goal is for the patient to barely notice the procedure happened, which is entirely achievable once you have done it a few times and have a smooth routine.

When the System Should Come Out Entirely

Not every problem calls for a bag change. Some situations call for removing the entire rectal tube. Most manufacturer guidelines recommend reassessing the need for the device every 24 to 48 hours, and most suggest a maximum indwelling time of around 29 days, though clinical practice varies. If the patient develops rectal bleeding, significant pain on assessment, or signs of abdominal distention that do not resolve after checking for tubing kinks or blockages, removal rather than another bag change is the right call.

Patients whose stool has firmed up to the point where it is no longer flowing through the catheter are also candidates for removal, since the device serves no purpose if it is just sitting in the rectum without collecting anything. And patients who develop mucosal injury visible at the anal margin should have the device removed and the injury evaluated before any decision about reinsertion. The three-percent major adverse event rate found in the ICU audit is low enough that these devices are considered safe for their intended use, but that safety depends partly on clinicians recognizing when a tube has done its job or is starting to cause harm.³

Differences Between Device Types

The bag-change procedure described above applies broadly, but the specifics vary across the main categories of fecal collection devices. Internal catheter systems, like the Flexi-Seal and similar products, use a balloon to anchor inside the rectum and connect to an external collection bag via tubing. External pouching systems, by contrast, are adhesive pouches that stick to the perianal skin and collect stool without anything inserted into the rectum. Both types require bag or pouch changes, but the mechanics differ. External pouches involve peeling the adhesive, cleaning the skin, and applying a fresh pouch. Internal systems involve the clamp-and-swap method at the tubing junction, leaving the catheter undisturbed.

The meta-analysis on skin protection found that both external pouch devices and internal catheter systems significantly reduced dermatitis compared to traditional methods, with external pouches showing a slightly larger protective effect in the pooled analysis.⁴ If you are managing a patient at home or in a long-term care setting and are uncertain which system you are dealing with, the most important thing is to follow the manufacturer’s instructions specific to that product. The overarching principles, keeping things clean, sealed, and monitored, are universal, but the connection mechanisms, bag sizes, and recommended change intervals are not.

1
Journal of Wound, Ostomy, and Continence Nursing. Stool Management Systems for Preventing Environmental Spread of Clostridium difficile: A Comparative Trial
2
PubMed. A retrospective review of outcomes using a fecal management system in acute care patients
3
PubMed Central. Faecal diversion system usage in an adult intensive care unit
4
PubMed. The effectiveness of faecal collection devices in preventing incontinence-associated dermatitis in critically ill patients with faecal incontinence: A systematic review and meta-analysis
5
Journal of Wound, Ostomy, and Continence Nursing. Do Intra-anal Bowel Management Devices Reduce Incontinence-Associated Dermatitis and/or Pressure Injuries?
6
PubMed Central. Rectal ulcers: a complication from stool management system use
7
Springer. Significant rectal bleeding as a complication of a fecal collecting device: report of a case
8
Journal of Wound, Ostomy, and Continence Nursing. Effect of a 1-Piece Drainable Pouch on Incontinence-Associated Dermatitis in Intensive Care Unit Patients With Fecal Incontinence: A Comparison Cohort Study
9
PubMed. A budget impact analysis comparing use of a modern fecal management system to traditional fecal management methods in two canadian hospitals
10
PubMed Central. Clinical and Health Economic Evaluation of a Novel Device for Fecal Management in Bedridden Patients
11
Taylor & Francis Online. The crucial role of fecal management systems in intensive care