A doctor may ask you to collect a poo sample if you have symptoms that need checking. These include:

• blood in your poo
• diarrhoea
• constipation
• stomach pain or discomfort

Bowel cancer screening

For information on how to use a home screening kit for bowel cancer, see bowel cancer screening.

You'll be given a small plastic container to put your poo sample in. Write your name, date of birth and the date on the container.

If you need to pee, do this before you collect your poo sample so there's no pee mixed with the poo.

To collect a poo sample:

1. Put something in the toilet to catch the poo, such as a clean disposable container, or spread newspaper or cling film (plastic wrap) over the rim of the toilet.
2. Do a poo. Make sure it does not touch the inside of the toilet, or the water.
3. Use a disposable spoon to put some poo in the container – sometimes the container comes with a spoon. Include any poo that's watery or has blood or slime in it.
4. Fill the container just under halfway with poo, then screw the lid shut.
5. Flush the rest of the poo down the toilet. Put everything you've used to collect the poo in a plastic bag, tie it up and put it in the bin.
6. Wash your hands with soap and warm running water.

The doctor will tell you when and how to return your poo sample.

They'll usually ask you to hand it in or post it in a prepaid envelope as soon as possible. It's important your poo sample is tested as soon as possible after you do it.

If you cannot take your poo sample in or post it within 24 hours, talk to your doctor so they can tell you what to do.

By testing your poo, it's possible to check for conditions affecting your digestive system.

A poo sample can be tested to help diagnose things like:

• what's causing diarrhoea
• Crohn's disease
• ulcerative colitis
• bowel cancer

• Lab Tests Online UK: stool culture
• Bleeding from the bottom (rectal bleeding)