TY - JOUR T1 - The added value of C-reactive protein measurement in diagnosing pneumonia in primary care: a meta-analysis of individual patient data JF - Canadian Medical Association Journal JO - CMAJ SP - E56 LP - E63 DO - 10.1503/cmaj.151163 VL - 189 IS - 2 AU - Margaretha C. Minnaard AU - Joris A.H. de Groot AU - Rogier M. Hopstaken AU - Alwin Schierenberg AU - Niek J. de Wit AU - Johannes B. Reitsma AU - Berna D.L. Broekhuizen AU - Saskia F. van Vugt AU - Arie Knuistingh Neven AU - Aleida W. Graffelman AU - Hasse Melbye AU - Timothy H. Rainer AU - Johann Steurer AU - Anette Holm AU - Ralph Gonzales AU - Geert-Jan Dinant AU - Alma C. van de Pol AU - Theo J.M. Verheij Y1 - 2017/01/16 UR - http://www.cmaj.ca/content/189/2/E56.abstract N2 - BACKGROUND: C-reactive protein (CRP) is increasingly being included in the diagnostic work-up for community-acquired pneumonia in primary care. Its added diagnostic value beyond signs and symptoms, however, remains unclear. We conducted a meta-analysis of individual patient data to quantify the added value of CRP measurement.METHODS: We included studies of the diagnostic accuracy of CRP in adult outpatients with suspected lower respiratory tract infection. We contacted authors of eligible studies for inclusion of data and for additional data as needed. The value of adding CRP measurement to a basic signs-and-symptoms prediction model was assessed. Outcome measures were improvement in discrimination between patients with and without pneumonia in primary care and improvement in risk classification, both within the individual studies and across studies.RESULTS: Authors of 8 eligible studies (n = 5308) provided their data sets. In all of the data sets, discrimination between patients with and without pneumonia improved after CRP measurement was added to the prediction model (extended model), with a mean improvement in the area under the curve of 0.075 (range 0.02–0.18). In a hypothetical cohort of 1000 patients, the proportion of patients without pneumonia correctly classified at low risk increased from 28% to 36% in the extended model, and the proportion with pneumonia correctly classified at high risk increased from 63% to 70%. The number of patients with pneumonia classified at low risk did not change (n = 4). Overall, the proportion of patients assigned to the intermediate-risk category decreased from 56% to 51%.INTERPRETATION: Adding CRP measurement to the diagnostic work-up for suspected pneumonia in primary care improved the discrimination and risk classification of patients. However, it still left a substantial group of patients classified at intermediate risk, in which clinical decision-making remains challenging. ER -