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Faecal Occult Blood Test

Also known as: FOB

Common Questions

1.  What kind of procedures might follow a positive FOB test?

Before or after you have an FOB test, you may have a rectal exam. A positive FOB test may be followed by:
  • Sigmoidoscopy: an examination of the rectum and lower colon (part of the intestines) with a lighted instrument to look for abnormalities, such as polyps;
  • Colonoscopy: a more thorough examination of the rectum and entire colon; and
  • A double contrast barium enema: a series of X-rays of the colon and rectum.

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2.  Should I buy and use self testing FOB kits which are available in some chemists?

The devices available in chemists detect blood in faeces using several different methods. Their sensitivity to detecting blood can vary and without the skills of either an experienced laboratory of doctor the results of these tests can be misleading. Consult your GP if you are are concerned and think you need a test performed.

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