Utilization, yield, and accuracy of the FilmArray Meningitis/Encephalitis panel with diagnostic stewardship and testing algorithm. Journal of clinical microbiology Broadhurst, M. J., Dujari, S. n., Budvytiene, I. n., Pinsky, B. A., Gold, C. A., Banaei, N. n. 2020

Abstract

Background: The impact of diagnostic stewardship and testing algorithms on utilization and performance of the FilmArray® Meningitis/Encephalitis (ME) Panel has received limited investigation.Methods: We performed a retrospective single-center cohort study assessing all individuals with suspected ME between February 2017 and April 2019 for whom the ME Panel was ordered. Testing was restricted to patients with cerebrospinal fluid (CSF) pleocytosis. Positive ME Panel results were confirmed before reporting through correlation with direct stain (Gram and Calcofluor white) and CSF Cryptococcal antigen or by repeat ME Panel testing. Outcomes included ME Panel test utilization rate, negative predictive value of non-pleocytic CSF samples, test yield and false-positivity rate, and time to appropriate de-escalation of acyclovir.Results: Restricting testing to pleocytic CSF samples reduced ME Panel utilization by 42.7% (263 vs 459 tests performed) and increased test yield by 61.8% (18.6% vs 11.5% positivity rate; P < 0.01) with application of criteria. The negative predictive value of normal CSF WBC for ME Panel targets was 100% (195/195) for non-viral targets and 98.0% (192/196) overall. All pathogens detected in non-pleocytic CSF samples were herpesviruses. Application of a selective testing algorithm based on repeat testing of non-viral targets avoided 75% (3/4) of false-positive results without generating false-negative results. Introduction of the ME panel reduced the duration of acyclovir treatment from an average of 66 hours (SD, 43) to 46 hours (SD, 36) (P = 0.03).Conclusions: Implementation of the ME Panel with restriction criteria and a selective testing algorithm for non-viral targets optimizes its utilization, yield and accuracy.

View details for DOI 10.1128/JCM.00311-20

View details for PubMedID 32493787