Clostridioides difficile toxin A+B

C. diff testing checks a sample of your stool (poop) for signs of an infection with a bacteria called C. diff . C. diff is also called C. difficile or Clostridioides difficile . It used to be called Clostridium difficile .

C. diff testing is most often used to find out if C. diff is causing diarrhea. But diarrhea can have many causes, so the test may be used with tests for parasites and other bacteria that also cause diarrhea.