Impact of rapid influenza PCR testing on hospitalization and antiviral use: A retrospective cohort study.

Rapid PCR-based influenza tests are increasingly used as point-of-care diagnostics in hospitals and clinics. To our knowledge, no prior studies have described clinical outcomes with implementation of rapid PCR-based influenza tests in hospitalized adult inpatients. Electronic medical records were used to assess differences in laboratory testing time and antiviral use among a subset of 175 consecutive adult inpatients tested for influenza in two respiratory seasons before and after implementation of rapid PCR-based influenza testing at an academic medical center. Of the 350 hospitalized inpatients included in this analysis, 96 (27%) were over 65 years of age and 308 (88%) had a comorbid condition. The overall time to result decreased significantly from 25.2 to 1.7 hr (P < 0.001) after implementation of rapid PCR-based influenza testing. Among influenza-negative patients, the frequency of oseltamivir initiation remained unchanged (before: 43% vs. after: 45%; P = 0.60), though the median duration of oseltamivir was significantly decreased from 1.1 to 0.0 days (P < 0.001). By providing an earlier result to clinicians, rapid PCR-based influenza tests may decrease unnecessary antiviral use among adult inpatients who test negative for influenza.