Overview: Campylobacter Antigen (Campy Ag) TestIntroduction: The Campylobacter Antigen Test detects Campylobacter antigens, indicating infection causing diarrhea or abdominal pain. Aligned with 2023 IDSA guidelines, it uses antigen detection for high sensitivity, aiding in infectious disease screening. This test is critical for guiding diagnosis, treatment, and improving outcomes in bacteriology for patients with suspected bacterial infections.
Other Names: Campylobacter Assay, Bacterial Diarrhea Test.
FDA Status: Laboratory-developed test (LDT), meeting bacteriology standards for diagnostic accuracy.
Historical Milestone: Campylobacter testing began in the 1970s with culture methods. Antigen detection assays emerged in the 1990s, and by the 2000s, rapid tests improved diagnostic speed.
Purpose: Diagnoses Campylobacter infection, guides treatment, and monitors bacterial presence in patients with diarrhea or abdominal pain.
Test Parameters: 1. Campylobacter Antigen
Pretest Condition: No fasting required. Collect stool at any time. Report symptoms like diarrhea or abdominal pain, and list recent travel or antibiotic use.
Specimen: 5-10 g stool (sterile container). Transport in a biohazard bag within 2 hours.
Sample Stability at Room Temperature: 2 hours
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: Not frozen
Medical History: Document diarrhea, abdominal pain, or recent travel/food exposure. Include current medications, especially antibiotics.
Consent: Written consent required, detailing the tests purpose, diagnostic implications, and potential need for antibiotic therapy.
Procedural Considerations: Uses antigen detection to identify Campylobacter antigens. Results are available in 1-2 days, enabling rapid clinical decisions.
Factors Affecting Result Accuracy: Recent antibiotics or improper storage can reduce sensitivity. Contamination may cause false positives.
Clinical Significance: Positive results confirm Campylobacter infection, prompting antibiotic therapy. Negative results may require culture or PCR testing.
Specialist Consultation: Consult an infectious disease specialist for result interpretation. A gastroenterologist referral is advised for severe cases.
Additional Supporting Tests: Stool culture, Campylobacter PCR, or electrolyte panel to confirm infection or assess dehydration.
Test Limitations: False negatives may occur with low antigen levels. Results require clinical correlation with history.
References: IDSA Diarrhea Guidelines, 2023; Clinical Infectious Diseases, Shane AL, 2022.
