Abstract
Background: The mean platelet volume (MPV) reflects the size of platelets. It has been shown to be inversely correlated with level of the inflammation in some chronic inflammatory diseases. This prospective study aims to show the usability of MPV as an inflammation marker in patients with active pulmonary tuberculosis (PTB) by comparison with healthy controls. In addition, its relationships with other inflammatory markers such as C-reactive protein (CRP) and the erythrocyte sedimentation rate (ESR) as well as with the radiological extent of disease were examined.
 Methods: This study included 82 patients with active PTB and 95 healthy subjects (control group). Whole blood counts, CRP level, and ESR were compared between the two groups. In the PTB group, the relationships between the radiological extent of disease and the MPV and other inflammation markers were investigated.
 Results: The MPV was 7.74 ± 1.33/μL in the PTB group and 8.20 ± 1.13/μL in the control group (p = 0.005). The blood platelet count, CRP level, and ESR were significantly higher in the active PTB group than in the control group (p < 0.0001). In the PTB group, CRP levels (r = 0.26, p = 0.003) and ESR (r = 0.39, p = 0.003), but not MPV (p = 0.80), were significantly correlated with the radiologic extent of the disease.
 Conclusions: The MPV was lower in patients with PTB than in healthy controls, however, the difference was limited. The MPV does not reflect the severity of the disease. The use of MPV as an inflammation marker and a negative acute-phase reactant in PTB does not seem to be reliable.
Highlights
The mean platelet volume (MPV) reflects the size of platelets
This study investigates the relationships between MPV and other inflammatory markers (ESR and C-reactive protein (CRP) level) as well as the radiological extent of the disease
The body mass index (BMI) was lower in patients with active pulmonary tuberculosis (PTB) than in the healthy controls, and the difference was statistically significant
Summary
It has been shown to be inversely correlated with level of the inflammation in some chronic inflammatory diseases This prospective study aims to show the usability of MPV as an inflammation marker in patients with active pulmonary tuberculosis (PTB) by comparison with healthy controls. Mtb and its components activate macrophages and lymphocytes, which secrete cytokines (TNF-α, IL-6, IL-8, and IL-12) enabling the development of a cellular immune response [3,4]. Of these cytokines, TNF-α and IL-6 in particular affect maturation of thrombopoietic cells and secretion of platelets into the circulation [5]. The CRP level, ESR, and presence of reactive thrombocytosis can reportedly be used to determine the disease activity, and these values are correlated with the disease severity [6,7,8]
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