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Fecal/Stool Tests: Fecal Occult Blood Test (FOBT) Fecal Immunochemical Test (FIT) Stool DNA (sDNA)

FOBT (Fecal Occult Blood Test)

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A fecal occult blood test can be given at home or it may be given in a doctor's office.  

A FOBT is usually given once a year.

Types of FOBTs

There are two types of FOBTs. Both start with taking tiny samples from three consecutive bowel movements which are put on a special card or cloth.

  • With a traditional guaiac smear test, the samples are sent to a lab where chemicals are added so any blood can be seen that cannot be seen just by looking at a sample. Doctors and other health care providers generally prefer the guiac smear because of its sensititivy and because large studies have shown the benefits of guaiac tests.
  • A newer test which involves flushable reagent pads. Many consumers prefer the flushable reagent pads because there is no stool handling and no laboratory processing. 

NOTE: It is important to follow the instructions that come with the test kit to ensure that the results are accurate. FOBT test kits are not expensive.

How to Prepare For An FOBT

To prepare for an FOBT, you will be instructed to avoid certain foods, supplements and medications for several days before you collect stool samples.

  • Some can cause false positives on the FOBT. A false positive means that the test will show you have colon cancer even if you don't. 
  • Some may create the opposite problem: they can cause a false negative.  A false negative means the test will show you do not have colon cancer, when in fact you do.
  • Some medications such as aspirin or ibuprofen can cause bleeding in your stomach or intestines.

Advantages of a fecal occult blood test:

  • No cleansing of the colon is necessary.

  • Samples can be collected in the comfort of your home.

  • The test can be simple to complete.

  • The cost is low compared with other colorectal cancer screening tests. Cost is covered by most health insurance.

  • FOBT does not cause bleeding or tearing/perforation of the lining of the colon.

Concerns related to using the fecal occult blood test include:

  • A fecal occult blood test does not detect polyps or lesions before they are cancerous. The test only detects blood in the stool.

  • The fecal occult blood test may miss some abnormalities. For example, the test may miss tumors that bleed in small amounts or not at all.

  • Patients may find the test unpleasant.

  • ????The dietary restrictions and changes, such as avoiding meat, certain vegetables, vitamin C, iron supplements and aspirin, and increasing fiber consumption. These restrictions and changes are often recommended for several days before a guaiac FOBT. These restrictions and changes are not required for FIT

  • Multiple days of stool collection.

  • Additional procedures, such as colonoscopy, may be needed if the test indicates an abnormality.

  • High false positive rates in which the test suggests an abnormality when there isn't one. Non-cancerous conditions may also cause blood in the stool.

  • The test must be done yearly to be considered a fairly reliable alternative to colonoscopy.


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