Figure 1From: Alveolar pentraxin 3 as an early marker of microbiologically confirmed pneumonia: a threshold-finding prospective observational studyFlow diagram for the study cohort. BAL, Bronchoalveolar lavage; ICU, Intensive care unit; MGH, Massachusetts General Hospital; PTX, Pentraxin 3; SICU, Surgical intensive care unit.Back to article page