The “C. difficile Toxin A+B (OS) (Toxin AB) Test” is a crucial stool test detecting harmful Toxin A and Toxin B proteins from Clostridioides difficile bacteria, which cause severe diarrhea (antibiotic-associated diarrhea) and colitis, especially in hospitalized patients. This test helps diagnose the infection early, guide specific antibiotic treatments (like vancomycin), and differentiate active infection from colonization, often combined with other markers (GDH) for accuracy