Backgrounds/Aims: Relationships of mean platelet volume (MPV) and thrombopoietin (TPO) with platelet turnover assessed by glycocalicin measurement were evaluated in thrombocytopenic patients. Methods: MPV, glycocalicin and platelet-associated IgG (PA-IgG) were measured in 107 patients with idiopathic thrombocytopenic purpura (ITP) and 19 patients with hypoproductive thrombocytopenia (HPT; aplastic anemia or leukemia), and TPO was measured in 53 ITP and 12 HPT patients. All the included ITP patients had PA-IgG ≥300% and glycocalicin ≥50% of control values, and HPT patients had PA-IgG <300% and glycocalicin <50% of control values. Results and Conclusions: MPV was higher in ITP than in HPT patients: 9.56 ± 1.69 and 7.59 ± 0.90 fl (p < 0.001). In the ITP group a direct correlation was detected between MPV and glycocalicin (r = 0.344, p < 0.001). This interaction was essentially expressed in patients with normal/increased glycocalicin (≥100% of control; r = 0.470, p < 0.001, n = 64). TPO was greatly enhanced in HPT in comparison with ITP patients (958 ± 659 and 11 ± 27 pg/ml, p < 0.001). In the ITP group a reverse correlation was detected between TPO and glycocalicin (r = -0.373, p = 0.006). © 2014 S. Karger AG, Basel

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