Who is screened for bowel cancer
This page tells you who can have regular tests (screening) for bowel cancer. You can find the following information
- A quick guide to what's on this page
- The UK bowel cancer screening programme
- An inherited bowel condition called FAP
- An inherited bowel condition called HNPCC
- A strong family history of bowel cancer
Who is screened for bowel cancer
The UK has a bowel cancer screening programme. The screening test checks for hidden (occult) blood in your stool (faeces). This is called an FOB test (faecal occult blood test). It is sent to people every 2 years, generally between the ages of 60 to 75. The screening age range varies slightly between England, Scotland, Wales and Northern Ireland. In Scotland, screening starts at age 50.
In England, a test to examine the inside of the rectum and lower bowel, called flexible sigmoidoscopy or bowel scope, is gradually being introduced as part of the screening programme. This will be a one off test for everyone aged 55. The FOB test will continue from age 60 as before.
People in high risk groups for bowel cancer are offered screening on the NHS at a younger age than the bowel screening programme. This usually means having a colonoscopy to examine the whole of the inside of the bowel. You can have screening if you have
- An inherited condition called familial adenomatous polyposis (FAP) – also called familial multiple polyposis
- An inherited condition called hereditary non polyposis colorectal cancer (HNPCC)
- A strong family history of bowel cancer (several relatives on one side of the family diagnosed with bowel cancer, or relatives diagnosed at a particularly young age)
- Ulcerative colitis or Crohn’s disease
- Had polyps removed from your bowel in the past
- Had bowel cancer before
You can view and print the quick guides for all the pages in the about bowel cancer section.
Bowel cancer screening aims to detect bowel cancer at an early stage when treatment is more likely to work. Generally in the UK, people aged between 60 and 75 are sent a stool testing kit (faecal occult blood test or FOB) every 2 years. The screening age range varies slightly between England, Scotland, Wales and Northern Ireland. For example in Scotland, screening starts at age 50.
In England, a test to examine the rectum and lower bowel, called flexible sigmoidoscopy or bowel scope, is gradually being introduced as part of the screening programme. Bowel scope screening will be a one off test for all men and women aged 55. The FOB test will continue from age 60 as before.
There is more information about the UK bowel screening programmes on the screening for bowel cancer page.
People with some other medical conditions have a higher risk of getting bowel cancer at a younger age. They are offered screening on the NHS earlier than in the bowel screening programme. This usually means having a colonoscopy to examine the whole of the inside of the bowel. The conditions which increase the risk of bowel cancer are detailed below.
FAP stands for familial adenomatous polyposis (also called familial multiple polyposis). This is a rare disease that runs in families. It causes lots of polyps to grow in the bowel. There is a high risk that one of these polyps will become cancerous. So people with FAP have either colonoscopies or sigmoidoscopies every year, to check for cancerous polyps. People with FAP are strongly advised by specialists to have surgery to remove their large bowel by age 25. This is because there is such a high probability of getting bowel cancer if you have FAP.
HNPCC stands for hereditary non polyposis colorectal cancer. This is an inherited gene fault (mutation) that increases bowel cancer risk. But you don't have lots of polyps, as people with FAP do.
If you definitely have HNPCC, your specialist will suggest that you start screening at age 25, or 5 years before the age at which your youngest affected relative got bowel cancer. You are likely to have colonoscopies every 2 years. There is not enough evidence yet for specialists to advise having the large bowel removed to prevent bowel cancer in HNPCC. But your specialist may suggest this if you do develop bowel cancer.
Strong family history means you have several relatives on the same side of the family diagnosed with bowel cancer, or diagnosed at a particularly young age.
If you have a strong family history, but no FAP gene or HNPCC gene, your specialist may advise you to have a colonoscopy when you are 35 to 45 years old. If you have no polyps, you probably won’t need another colonoscopy until the age of 55. It takes many years for a polyp to develop into cancer, so more frequent colonoscopies are not necessary.
The more relatives you have with bowel cancer, or the younger the diagnosed relatives are, the higher the chance that there is a cancer gene in the family. If you think you have a strong family history of bowel cancer, talk to your GP. They may send you to your local genetics clinic, where you will see someone who specialises in looking at family histories and working out the likely risk of a particular disease. They will ask you about your family, and if necessary refer you to a bowel specialist for regular screening.
Ulcerative colitis and Crohn's disease are bowel diseases that cause inflammation and ulceration inside the bowel. You have an increased risk of bowel cancer if you have either of these diseases. The level of risk depends on different factors such as how long you have had the disease, which part of the bowel is affected and how severe it is, as well as if you have a family history of bowel cancer. You may have a screening colonoscopy 10 years after your symptoms first began. Your specialist may then suggest having regular colonoscopies every 1 to 5 years, depending on your risk.
If you have had polyps removed from your bowel in the past, your doctor may suggest you have a sigmoidoscopy or colonoscopy every so often. This is to pick up any more polyps before they develop into an invasive cancer. How often you have a bowel examination depends on how many polyps you've had, how big the polyps were and how abnormal the cells were. The larger the polyp and the more abnormal the cells, the greater the risk of developing cancer.
If you've had 1 or 2 polyps smaller than 1cm across, you have a slightly higher than average risk of developing bowel cancer, but it is still a very low risk. Your doctor may suggest a colonoscopy every 5 years. But if you then have a colonoscopy that finds no polyps at all, you may be able to stop this screening.
If you've had 3 or 4 polyps, or at least one that was more than 1cm across, you have a moderate (intermediate) risk of developing bowel cancer. Your specialist will probably suggest a colonoscopy every 3 years. But if you have 2 colonoscopies one after the other (consecutively) with no polyps at all, you may be able to stop this screening.
If you've had more than 5 polyps, or more than 3 that were bigger than 1cm across, you have a much higher than average risk of developing bowel cancer. Your specialist will advise you to have a colonoscopy every year until you stop having so many polyps. If you start to have fewer polyps at each colonoscopy, then you may be able to go down to screening every 3 years.
If you are not at higher than average risk of bowel cancer, there is currently no screening available on the NHS for people outside the age range covered by the UK bowel screening programmes. If you want to, you can pay for screening privately. You can do this by going to a private health clinic (these are listed in your local phone book). But you should check their reputation with your GP first.
Chemists have kits on sale that you can use to test your bowel motions for blood. These vary in how well they work, so you should read and follow the instructions carefully. Remember that
- 9 out of 10 people who have a test indicating blood in the stool do not have cancer
- Your result may show no blood in the stool, but you could still have a bowel cancer that was not bleeding when you did the test
So using a kit on your own is not very reliable, even if you follow the instructions carefully. Talk to your GP about why you feel you should be screened. Your GP may be able to put your mind at rest or refer you to a family cancer clinic. If you do want to use a kit like this, ask your local chemist about what is available and get their advice on how to use it. You will still need to speak to your GP if you get an abnormal test result from a bought test kit.
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