How to Change a Nephrostomy Bag and Care for the Site

Changing a nephrostomy bag is a straightforward process that most patients or caregivers can learn to do at home with clean technique, a few basic supplies, and about ten to fifteen minutes. The tube itself drains urine directly from your kidney through your back into an external collection bag, and the bag needs to be swapped regularly to keep the system flowing and the site clean. Getting comfortable with the routine matters more than you might expect: structured patient education on nephrostomy care has been shown to cut unscheduled hospital visits roughly in half and save thousands in avoidable healthcare costs.¹

Why You Have a Nephrostomy Tube

A percutaneous nephrostomy, or PCN, is a thin flexible tube placed through the skin of your back directly into the kidney’s drainage system. Its job is to let urine bypass a blockage somewhere further down the urinary tract. The blockage might be a kidney stone, a tumor pressing on the ureter, or swelling from a previous surgery.² When the kidney cannot drain on its own, urine backs up and the kidney swells, a condition called hydronephrosis. If that backed-up urine also becomes infected, the situation can turn dangerous quickly. Urgent nephrostomy placement is often the fastest way to decompress an obstructed, infected kidney.³

Whatever the reason for placement, the tube exits through a small puncture site in your flank area and connects to a drainage bag you wear on your leg during the day or hang beside the bed at night. Understanding the basic setup helps the bag-change process make more sense: you are working with a closed system that should stay as clean as possible whenever you open it.

Supplies to Gather Before You Start

Having everything within arm’s reach before you begin prevents you from fumbling mid-change or setting down a clean connector on a non-sterile surface. You will need:

• New drainage bag: a leg bag for daytime use or a larger overnight bag, depending on the time of day.
• Sterile gauze pads: for cleaning the connection point and the skin around the tube.
• Antiseptic solution: typically povidone-iodine or chlorhexidine swabs, whichever your care team has recommended.
• Clean gloves: at least two pairs, so you can re-glove if needed.
• Medical tape or a securement device: to anchor the tube against your skin once the bag is changed.
• A plastic bag or lined container: for disposing of the used bag and soiled dressings.

If your team has also asked you to change the site dressing at the same time, add sterile adhesive dressings or transparent film dressings to the list. Some clinics provide pre-assembled kits; if yours does, verify that nothing inside is expired before you begin.

Step-by-Step Bag Change

Wash your hands thoroughly with soap and warm water for at least twenty seconds, then dry with a clean towel. Put on your first pair of gloves. Place a clean towel or disposable pad on the surface where you will be working so the new bag has somewhere clean to sit.

Start by clamping the nephrostomy tube near the connection point. Most tubes have a built-in slide clamp or a small stopcock. Clamping prevents urine from leaking while the bag is disconnected. Then disconnect the used bag by twisting or pulling the connector apart, depending on the type. Keep the open end of the tube pointed downward and avoid touching it with your fingers or letting it brush against your clothing.

Wipe the exposed connector tip on the tube with an antiseptic swab, using a single firm stroke from the tube outward. Do the same with the connector on the new bag. Let both air-dry for a few seconds; the antiseptic works better if it is not wiped off immediately. Connect the new bag to the tube, making sure the connection clicks or twists securely into place. Release the clamp. You should see urine begin to flow into the new bag within a few moments.

If no urine flows after you release the clamp, check that the tube is not kinked or compressed under your body. Also make sure the clamp is fully open. A tube that remains dry for more than a few minutes after a bag change warrants a call to your care team.

Caring for the Skin Around the Tube

The exit site, where the tube passes through your skin, needs regular cleaning and a fresh dressing. How often depends on your clinical team’s instructions, but many patients change the dressing every one to two days or whenever it becomes wet, loose, or visibly soiled.

To clean the site, remove the old dressing gently, peeling it away from the skin rather than pulling on the tube. Put on fresh gloves. Using sterile gauze moistened with antiseptic or normal saline, clean around the tube in a circular motion starting at the tube and working outward. Do not push the gauze back toward the tube once it has touched surrounding skin. Let the area air-dry briefly, then apply a new sterile dressing. Pre-cut drain sponges with a slit fit neatly around the tube and lie flat under the adhesive dressing.

Watch the skin for redness, swelling, warmth, or any discharge that is thick, discolored, or smells unusual. A small amount of clear or slightly blood-tinged fluid around a fresh site is normal in the first few days after placement, but anything that looks like pus or that worsens over time should be reported to your medical team.

Keeping the Tube Secure

A tube that gets accidentally pulled or tugged can partially or fully dislodge, which is both painful and potentially dangerous if the tract has not matured enough to hold open on its own. Research on catheter stability across different medical settings shows that dislodgement rates vary widely depending on how the tube is anchored, with external securement devices and adhesive anchors generally outperforming simple tape alone.⁴

In practice, this means taping the tube to your skin in a gentle loop or curve so that any accidental pull creates slack before tension reaches the kidney. Some patients prefer commercial tube-anchoring devices that stick to the skin and grip the tube in a small clamp. Whichever method you use, reposition the tape or anchor every time you change the dressing to prevent skin breakdown from adhesive sitting in the same spot too long. Before bed, make sure the overnight bag is positioned below the level of your kidney and that the tubing has enough length to allow you to turn without pulling.

Recognizing and Preventing Infection

Urinary tract infections are the most common complication of having a nephrostomy tube. Literature reviews report that catheter-associated infections occur in roughly 8 to 40 percent of patients, depending on how long the tube stays in, the patient’s other health conditions, and how carefully the tube is handled.⁵ The bacteria most often responsible are common gut organisms that find their way onto the tube’s surface and form a sticky layer called a biofilm. Once a biofilm establishes itself, it is difficult to clear with antibiotics alone, which is one reason tubes are exchanged on a regular schedule rather than left in place indefinitely.

Signs that an infection may be developing include fever, chills, cloudy or foul-smelling urine, increasing pain at the tube site, and a general feeling of being unwell. In a study of routine office-based tube replacements performed without prophylactic antibiotics, about 13 percent of patients developed a fever afterward, though most of those fevers resolved on their own without treatment. Only a small number needed hospitalization, and the main factor that raised a patient’s risk was having multiple other health conditions.⁶

Cancer patients with nephrostomy tubes face a higher baseline risk of serious infection. Research on nephrostomy-associated sepsis in this group has identified low pre-procedure platelet counts and certain imaging findings around the kidney as independent predictors of sepsis.⁷ If you are managing a nephrostomy during cancer treatment, your care team will likely monitor bloodwork more closely and may prescribe antibiotics around exchange procedures.

The most effective infection-prevention steps are the ones you control at home: keeping the site and connections clean during every bag change, washing your hands before and after touching the system, avoiding disconnecting the bag unnecessarily, and drinking enough fluid to keep urine flowing steadily through the tube. Good flow is your best defense against bacterial buildup inside the system.

How Often the Tube Itself Gets Exchanged

Changing the drainage bag is something you do daily or every few days. Exchanging the tube itself is a separate procedure performed by a healthcare provider, typically in an outpatient setting every four to six weeks. The exact interval depends on your clinical situation. The tube is swapped because even with meticulous care, biofilm accumulates on the catheter surface over time and the tube material gradually degrades. Exchanging it resets the clock on both problems.

Certain patients need shorter exchange intervals. Pregnant women with nephrostomy tubes, for example, have been shown to need exchanges roughly every three weeks on average rather than the standard six-week cycle. In one study, pregnant patients were nearly four times more likely to need an unscheduled intervention before a planned six-week exchange, likely because hormonal changes and the growing uterus alter urine flow dynamics in ways that accelerate tube encrustation.⁸ If your drainage slows noticeably well before your scheduled exchange, contact your team rather than waiting for the appointment.

Troubleshooting Common Problems

Several things can go wrong between scheduled exchanges, and knowing the difference between a minor issue you can fix and a situation that needs medical attention helps you avoid unnecessary panic as well as unnecessary delay.

• Reduced or stopped drainage: Check for kinks, a closed clamp, or the bag being positioned above kidney level. If none of those are the cause, the tube may be blocked by sediment or clots. Gently reposition your body and try flushing the tube only if your team has specifically trained you to do so. Otherwise, call your clinic.
• Leaking around the tube site: Small leaks often mean the tube is partially blocked and urine is finding its way around the outside. This usually indicates the tube needs attention from your provider rather than just a new dressing.
• Blood in the urine: A small amount of pink-tinged urine is common after a tube exchange or after physical activity. Bright red blood or clots that do not clear within an hour or two warrant a call to your care team.
• Tube falling out: If the tube comes out entirely, cover the site with a clean dressing and get to your clinic or emergency department as soon as possible. The tract can begin to close within hours, so time matters.

Standardized care pathways that spell out when to self-manage and when to seek help have been shown to reduce inconsistencies in how nephrostomy problems are handled and improve outcomes for patients managing tubes at home.⁹

Showering, Sleeping, and Getting Around

Most people with a nephrostomy tube can shower, though soaking in a bath, pool, or hot tub is generally off limits because submerging the exit site increases infection risk. Before showering, tape a waterproof cover or plastic wrap over the dressing to keep it dry. Some patients find that showering just before a scheduled dressing change is easiest, since the old dressing is coming off anyway.

Sleeping takes some adjustment. The overnight bag holds more urine than a leg bag, so you do not need to get up to empty it, but you do need to position it below mattress level and make sure the tubing is not trapped under your body. Many people find it most comfortable to sleep on the opposite side from the tube site, or on their back with a small pillow supporting the tubing. Wearing a loose shirt tucked in lightly can help keep the tube from snagging on bedding.

For daily movement, a leg bag strapped securely to your thigh or calf under clothing is discreet enough for most activities. Avoid vigorous contact sports or any activity with a high risk of a direct hit to the flank area. Walking, light exercise, and desk work are generally fine. If your job involves heavy lifting, discuss specific restrictions with your provider, because straining can put pressure on the tube site.

Nephrostomy Tubes Compared to Internal Stents

If you have been offered a choice between a nephrostomy tube and an internal ureteral stent, or if you are curious why your team chose one over the other, the trade-offs are worth understanding. A ureteral stent sits entirely inside the body, running from the kidney down to the bladder, so there is no external bag and no exit-site care. That sounds simpler, and in some ways it is. But stents come with their own set of problems, especially irritative bladder symptoms like urgency, frequency, and pain during urination. In a direct comparison, patients with stents reported significantly more of these urinary symptoms than patients with nephrostomy tubes.¹⁰

On the other hand, nephrostomy patients reported needing more help with daily tube care. Infection rates between the two approaches were similar. And when researchers looked at overall quality of life using standardized measures, neither group came out clearly ahead. In other words, a nephrostomy tube trades internal discomfort for external maintenance. When the obstruction is caused by an infected and blocked kidney, both approaches work about equally well in terms of resolving the infection and getting patients out of the hospital, according to a meta-analysis that pooled results across multiple studies.¹¹

Why Patient Education Makes a Measurable Difference

Living with a nephrostomy tube is genuinely manageable once you know what you are doing, but the learning curve matters. A randomized trial that compared patients who received a structured educational program on nephrostomy management with patients who got standard discharge instructions found that the educated group averaged fewer than two unscheduled visits over the study period, compared to four in the control group. The educated group also incurred substantially lower healthcare costs, to the tune of several thousand euros.¹ That gap is not because the control group had sicker patients. It is because small mistakes and uncertainties in daily care, the kind that arise when you are not quite sure if a drainage change looks right or whether mild redness is normal, pile up into avoidable emergency room trips.

If your hospital or clinic offers a nephrostomy education session, take it. If they do not, ask your interventional radiology or urology team to walk you through the full routine at least once before you go home, and request written instructions with pictures you can refer to later. Practice the bag change under supervision before you have to do it alone. Having someone watch you do it and correct your technique in real time is worth far more than a handout you read on the drive home.