What it’s Like?

Guaiac Fecal Occult Blood Test (gFOBT)

The gFOBT checks for blood in feces and must be done every 3 years. You will take samples of your stools over three days, swab the samples on a chemically treated card, and send the card to the lab for analysis. If blood is detected, you will be advised to have a colonoscopy.


  • Inexpensive
  • Widely available
  • DIY at home
  • Uncomplicated


  • Not all cancers bleed, so the gFOBT can miss some cancers
  • Handling samples is off-putting for many

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