What is a Bladder Catheter?

M. DePietro

The bladder holds urine until it can be expelled from the body through urination. Once the kidneys create the urine, it travels through the tubes called ureters into the bladder. A bladder catheter, often called a urinary catheter, is a tube inserted into the bladder to drain the urine from the body instead of normal urination. A bag attached to the catheter tube collects the urine.

The human urinary tract, including the bladder in pink at the bottom.
The human urinary tract, including the bladder in pink at the bottom.

A catheter may be needed for a variety or reasons. In individuals who have trouble urinating, either temporally or long-term, a bladder catheter may be needed. Catheters are also inserted when the volume of urine needs to be measured or collected and tested for diagnostic purposes. Catheters are also often used during surgery to monitor urine flow.

Bladder catheters connect to an external bag where urine is collected.
Bladder catheters connect to an external bag where urine is collected.

Urinary catheters can be used for a very short time, during procedures, such as surgery or while recovering from an injury or illness. Long-term bladder catheters may also be needed for individuals with problems such as spinal cord injuries. These types of catheters are called long-term indwelling catheters.

A urinary catheter.
A urinary catheter.

The procedure to place a bladder catheter is called catheterization. The urine comes out of the bladder and flows through the urethra to leave the body. Prior to the catheterization, the urethra is cleaned and a sterile bladder catheter is inserted into the bladder through the urethra. A small balloon is attached to the end of the catheter to hold it in place. A small amount of sterile water will be inserted into the port to inflate the balloon once it’s in the bladder.

Inserting a bladder catheter is usually a quick procedure. Although it’s usually not painful, a patient may feel some discomfort. The length of time the catheter stays in the bladder depends on the initial reason it was placed and patient condition. Removal of the catheter involves deflating the balloon and slowly pulling the tube out of the bladder through the urethra.

Complications during placement of the bladder catheter or shortly after are uncommon, but can occur. Bleeding or trauma to the urethra can occur, especially if the balloon is inflated before it is threaded completely through the urethra. The catheters can also become blocked, which obstructs the flow of urine from the body.

Other complications or risks associated with catheter use include a bladder infection, which can travel to the kidneys. Skin irritation and breakdown around the catheter site can also occur. Complications from a bladder catheter are more likely to occur when it is used long-term.

A 3-way catheter is used to treat bladder infections.
A 3-way catheter is used to treat bladder infections.

You might also Like

Readers Also Love

Discussion Comments


@ElizaBennett - The Foley catheter is the one they leave in for a while. When I was in labor, I could hardly pass any urine for some reason and I thought emptying my bladder might move things along. I asked to be catheterized.

That time, they used an intermittent catheter, not a Foley cath. It had no balloon on it to hold in place--they just stuck it in and removed it after it had done its thing. But the problem returned and that time, I went ahead and got a Foley. I would up with a C-section, too. I had been hooked up to one thing at a time, none of which I wanted to be hooked up to, so it felt good to be getting back to myself again.


Urinary catheters are usually Foley catheters, right? I had a planned C-section (placenta previa) and they put one of those in before my surgery. I hated being hooked up to so much stuff! I remember how much I looked forward to all the unhooking. First the oxygen (I had low sats), then the inflating leg cuff things when I showed I could get out of bed, then the catheter, and finally the IV once I showed I could have breakfast.

Post your comments
Forgot password?