title: Diagnostic value of platelet indices and bone marrow megakaryocytic parameters in immune thrombocytopenic purpura.
abstract: Platelet indices could mirror megakaryopoietic activity in immune thrombocytopenic purpura (ITP), but its specificity and sensitivity need to be studied. The diagnostic performance of platelet indices was analyzed by receiver-operating characteristic curves, and the probability of true positive (sensitivity) and true negative (specificity) in predicting ITP, myelodysplasia, or controls was determined. Mean platelet volume (MPV) was higher, whereas plateletcrit (PCT) was significantly lower in ITP than in myelodysplasia and controls. The platelet distribution width in ITP patients was lower than in myelodysplasia, but higher than in controls. Increased megakaryocytes were only observed in ITP. A strong positive correlation was found between MPV and quantities of granular megakaryocytes, whereas a negative relationship existed between MPV and platelet-form megakaryocytes. In receiver-operating characteristic analysis, MPV and PCT gave a sensitivity of 70.3% (89.8%) and specificity of 74.8% (84.7%) at a cutoff of 9.35 (0.085) in diagnosis of ITP. Combined parallel test of MPV and PCT increased the sensitivity to 97.5 with 64.1% specificity, whereas series test increased the specificity to 94.7 with 62.7% sensitivity. Our results suggest that MPV, PCT, and platelet distribution width represent megakaryopoietic activity in bone marrow and may be reliable markers in ITP diagnosis.
authors.affiliation: aLaboratory Medicine Center, Nangfang Hospital, Southern Medical University, Guangzhou bDepartment of Cell Biology and Genetics, Shantou University Medical College cShantou University Medical College, Shantou, Guangdong, China.
authors.forename: Yue-Ting
authors.initials: YT
authors.lastname: Tang
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.forename: Ya-Zhen
authors.initials: YZ
authors.lastname: Li
authors.forename: Huan-Zhu
authors.initials: HZ
authors.lastname: Chen
authors.forename: Xiao-Lan
authors.initials: XL
authors.lastname: Chang
authors.forename: Qing-Dong
authors.initials: QD
authors.lastname: Xie
authors.forename: Xiao-Yang
authors.initials: XY
authors.lastname: Jiao
mesh_terms: D000293:Adolescent; D000328:Adult; D001792:Blood Platelets / Q000473:pathology*; D001853:Bone Marrow / Q000002:abnormalities*; D005260:Female; D006801:Humans; D008297:Male; D063847:Mean Platelet Volume / Q000379:methods*; D008533:Megakaryocytes / Q000473:pathology*; D008875:Middle Aged; D010976:Platelet Count / Q000379:methods*; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000175:diagnosis* / Q000473:pathology; D012189:Retrospective Studies; D055815:Young Adult