Roth D, et al. - In adult patients without apparent anatomical abnormalities scheduled to undergo general anaesthesia, the diagnostic accuracy of commonly used bedside examination tests for assessing the airway was assessed in this systematic review including 133 studies (127 cohort type and 6 case–control) comprising 844,206 subjects. Seven bibliographic databases were searched for studies that reported the following pre-specified bedside index screening tests against a reference standard (from date of inception to 16 December 2016): the Mallampati test (6 studies); modified Mallampati test (105 studies); Wilson risk score (6 studies); thyromental distance (52 studies); sternomental distance (18 studies); mouth opening test (34 studies); and the upper lip bite test (30 studies). Studies with moderate to high methodological quality were found. The reference standards included difficult facemask ventilation, difficult laryngoscopy, difficult intubation and failed intubation in seven, 92, 50 and two studies, respectively. The most favourable diagnostic test accuracy properties were displayed by the upper lip bite test, there was not even a single bedside screening test that well suited for detecting unanticipated difficult airways, as many of them were missed.