Rate and consequences of missed Clostridioides (Clostridium) difficile infection diagnosis from nonreporting of Clostridioides difficile results of the multiplex GI PCR panel: experience from two-hospitals.

Introduction: It is common among microbiology laboratories to blind the Clostridioides difficile (C. difficile) BioFire FilmArray GI Panel result in fear of overdiagnosis.

Methods: We examined the rate of missed community-onset C. difficile infection (CDI) diagnosis and associated outcomes. Adult patients with FilmArray GI Panel positive for C. difficile on hospital admission who lacked dedicated C. difficile testing were included.

Results: Among 144 adults with a FilmArray Panel positive for C. difficile, 18 did not have concurrent dedicated C. difficile testing. Eight patients were categorized as possible, 5 as probable and 4 as definite cases of missed CDI diagnosis. We observed associated delays in initiation of appropriate therapy, intensive care unit admissions, hospital readmissions, colorectal surgery and death/discharge to hospice. Five out of 17 lacked risk factors for CDI.

Conclusion: The practice of concealing C. difficile FilmArray GI Panel results needs to be reconsidered in patients presenting with community-onset colitis.