RT Journal Article SR Electronic T1 False-positive Xpert® Xpress SARS-CoV-2 assay in an emergency room and trauma center JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 965 OP 970 DO 10.15537/smj.2022.43.8.20220317 VO 43 IS 8 A1 Hyerim Kim A1 Soeun Jeon A1 Sun Hack Lee A1 Hyun-Su Ri A1 Hyeon-Jeong Lee A1 Jeong-Min Hong A1 Sung In Paek YR 2022 UL http://smj.org.sa/content/43/8/965.abstract AB Objectives: To review reports false-positive Xpert results in an emergency room and trauma center.Methods: Patients’ data with false-positive Xpert results from November 2020 to February 2022 at Pusan National University Hospital, Busan, Republic of Korea, were extracted from the electronic medical records.Results: The positive predictive value of Xpert was 40%. Of the 12 patients with false-positive results, 5 (41.7%) were re-positives (such as, patients recovered from coronavirus disease-19 [COVID-19]), and 4 (33.3%) had head or facial trauma. Two out of 4 head or facial trauma cases had documented sample contamination with blood.Conclusion: We found a high incidence of false-positive Xpert results among patients who recovered from COVID-19 and those with head or facial injury. Careful history taking for COVID-19 and physical examination of the sample collection site is essential before Xpert analysis.