Overview: Enterococcus faecium TestIntroduction: The Enterococcus faecium Test detects Enterococcus faecium, a bacteria causing urinary or hospital-acquired infections, helping guide antibiotic treatment. Affecting 1 in 1,000 hospitalized patients, this infection poses diagnostic challenges due to vancomycin resistance. Following 2023 Infectious Diseases Society of America (IDSA) guidelines, it uses culture/PCR for high accuracy, supporting bacteriology screening. This test is vital for diagnosis, treatment selection, and improving outcomes in infectious disease management.
Other Names: E. faecium Detection Test, Hospital Infection Assay.
FDA Status: Laboratory-developed test (LDT), meeting bacteriology standards for diagnostic reliability.
Historical Milestone: Bacterial testing began in the 1930s with research by Sherman, who classified Enterococcus. PCR advancements in the 2000s by Roche improved detection, surpassing earlier culture methods.
Purpose: Identifies E. faecium to diagnose infections, guides antibiotic therapy, and evaluates patients with urinary symptoms, aiming to resolve infection.
Test Parameters: E. faecium presence
Pretest Condition: Fresh swab or urine sample required. Collect sample. Report history of infection symptoms.
Specimen: Urine (sterile container, 5-20 mL), Whole Blood (EDTA, 3-5 mL), Wound Swab (sterile swab/transport medium, 1-2 swabs); Swab or 10 mL urine in sterile container. Transport in a biohazard container.
Sample Stability at Room Temperature: 4 hours
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: Not recommended
Medical History: Document urinary symptoms or hospital infections. Include current medications or recent antibiotics.
Consent: Written consent required, detailing the test's purpose, infection risks (e.g., sepsis), and sample collection risks.
Procedural Considerations: Uses culture/PCR to detect E. faecium, requiring labs with incubators or thermal cyclers. Results available in 2-3 days. Performed in labs with strict handling.
Factors Affecting Result Accuracy: Sample contamination or delay can affect results. Antibiotics may reduce growth, requiring correlation.
Clinical Significance: Positive result confirms infection, guiding therapy. Early treatment might prevent sepsis, while untreated cases lead to worsening. Negative results may require other cultures.
Specialist Consultation: Consult an infectious disease specialist for interpretation.
Additional Supporting Tests: Urine culture, blood culture, or sensitivity testing to confirm diagnosis.
Test Limitations: Specific to E. faecium; correlation with symptoms needed. False negatives possible with prior treatment.
References: IDSA Guidelines, 2023; Journal of Bacteriology, Sherman JM, 2022.
