Aspergillus‐PCR in bronchoalveolar lavage ‐ diagnostic accuracy for invasive pulmonary aspergillosis in critically ill patients

Abstract Background The diagnosis of invasive pulmonary aspergillosis (IPA) in intensive care unit (ICU) patients is challenging, and the role of Aspergillus‐PCR in bronchoalveolar lavage (BAL) is unknown. Objectives This study evaluated diagnostic accuracy of Aspergillus‐PCR in BAL in IPA in three different cohorts: ICU‐admitted patients with COVID‐19, ICU‐admitted patients without COVID‐19 and immunocompromised patients. Methods All stored available BAL samples collected from three patient groups were tested with Aspergillus‐PCR (AsperGenius ® ). IPA was diagnosed according to appropriate criteria for each patient group. Results We included 111 BAL samples from 101 patients: 52 (51%) patients admitted to ICU for COVID‐19, 24 (24%) admitted to ICU for other reasons and 25 (25%) immunocompromised. There were 31 cases of IPA (28%). Aspergillus‐PCR sensitivity was 64% (95% CI 47–79) and specificity 99% (95% CI 93–100). Aspergillus‐PCR sensitivity was 40% (95%CI 19–64) in ICU COVID‐19, 67% (95% CI 21‐93) in non‐COVID‐19 ICU patients and 92% (95%CI 67–98) in the immunocompromised. The concordance between positive BAL‐GM and BAL‐PCR in patients with and without IPA was significantly lower in ICU patients (32%; 43% in COVID‐19, 18% in non‐COVID‐19) than in the immunocompromised (92%), p < .001. Conclusions Aspergillus‐PCR in BAL improves the diagnostic accuracy of BAL‐GM in ICU patients.