Blood Drug Testing

What does OBH stand for when getting blood tests?

If you are getting blood tests and they check off OBH1 OBH2 AND OBH3 what are they testing for? And what does OBH stand for?

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1. http://www.calgarylabservices.com/LabTests/AlphabeticalListing/O/Occult-Blood-Stool.htm