Multiplex Stool PCR May Prevent Unnecessary Treatment Escalation During IBD Flares: FG | September 2026

Introduction:

Enteric infections can closely mimic an IBD flare, creating a difficult clinical question: infection or active inflammation? This meta-analysis evaluated whether stool multiplex PCR (MPCR) improves pathogen detection and influences treatment decisions in patients with IBD.

Why was this study needed?

GI infections and IBD flares often have overlapping presentations.

Missing infection may lead to inappropriate immunosuppression escalation.

Conventional stool testing may have limited pathogen detection.

The clinical value of broader MPCR testing in IBD remains uncertain.

Key Findings:

20 studies involving 5,273 patients were included.

Overall enteric pathogen detection with MPCR was approximately 30%.

Among patients presenting with an IBD flare, 49% had a pathogen detected.

MPCR detected significantly more infections than conventional testing (OR 4.31).

Importantly, MPCR testing was associated with substantially less IBD therapy escalation (OR 0.35).

Positive PCR results increased antibiotic use.

MPCR testing did not clearly reduce hospitalization, emergency visits, or surgery.

Evidence was predominantly retrospective and highly heterogeneous; pathogen detection may not always indicate clinically relevant infection.

Bottom Line:

Stool multiplex PCR detects substantially more enteric pathogens during suspected IBD flares and may prevent unnecessary immunosuppressive escalation. Whether this translates into better long-term outcomes requires prospective trials.