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    The mean platelet volume levels in children with PFAPA syndrome
    (Elsevier Ireland Ltd, 2014) Tekin, Mehmet; Toplu, Yuksel; Kahramaner, Zelal; Erdemir, Aydin; Gulyuz, Abdulgani; Konca, Capan; Uckardes, Fatih
    Objectives:. To assess whether mean platelet volume (MPV) can be used as a marker in the differential diagnosis of periodic fever, aphthous stomatitis, pharyngitis, adenitis (PFAPA) syndrome. Methods: The leucocyte counts, thrombocyte counts, and MPV values of 57 children with PFAPA syndrome were recorded during an attack and an attack free period. These values were compared with a healthy control group of 55 individuals. Demographic features of the PFAPA patients group including age, gender and age of first attack, age at diagnosis, frequency of attacks, serum reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were also recorded. Results: The MPV values of the children with PFAPA both during an attack and attack free period were found significantly lower than the MPV values of healthy control group (p < 0.001). Also, the MPV values of the children with PFAPA during an attack were significantly lower than in attack free periods (p < 0.001). The MPV values showed no correlation with leucocytes counts, CRP, and ESR during attacks. A 8.30 fl [area under the curve (AUC: 0.965)] optimal cutoff value of MPV with a sensitivity of 89.5% and specificity of 92.8% was determined during an attack in children with PFAPA. Conclusions: The MPV values during an attack and attack free period of patients with PFAPA is lower than in controls. The MPV values may be used as a marker in the differential diagnosis of PFAPA syndrome but more studies are needed and they should be prospective in order to validate this data. (C) 2014 Elsevier Ireland Ltd. All rights reserved.