title: [Assessment study on a set of platelet-rich plasma preparation].
abstract: OBJECTIVE
  To calculate the recovery rate and enrichment factor and to analyse the correlation by measuring the concentrations of platelets, leukocyte, and growth factors in platelet-rich plasma (PRP) so as to evaluate the feasibility and stability of a set of PRP preparation.
  
  
  METHODS
  The peripheral blood (40 mL) was collected from 30 volunteers accorded with the inclusion criteria, and then 4 mL PRP was prepared using the package produced by Shandong Weigao Group Medical Polymer Company Limited. Automatic hematology analyzer was used to count the concentrations of platelets and leukocyte in whole blood and PRP. The enrichment factor and recovery rate of platelets or leukocyte were calculated; the platelet and leukocyte concentrations of male and female volunteers were measured, respectively. The concentrations of platelet-derived growth factor (PDGF), transforming growth factor beta (TGF-beta), and vascular endothelial growth factor (VEGF) were assayed by ELISA.
  
  
  RESULTS
  The platelet concentrations of whole blood and PRP were (131.40 +/- 29.44) x 10(9)/L and (819.47 +/- 136.32) x 10(9)/L, respectively, showing significant difference (t = 27.020, P = 0.000). The recovery rate of platelets was 60.85% +/- 8.97%, and the enrichment factor was 6.40 +/- 1.06. The leukocyte concentrations of whole blood and PRP were (5.57 +/- 1.91) x 10(12)/L and (32.20 +/- 10.42) x 10(12)/L, respectively, showing significant difference (t = 13.780, P = 0.000). The recovery rate of leukocyte was 58.30% +/- 19.24%, and the enrichment factor was 6.10 +/- 1.93. The concentrations of platelets and leukocyte in PRP were positively correlated with the platelet concentration (r = 0.652, P = 0.000) and leukocyte concentration (r = 0.460, P = 0.011) in whole blood. The concentrations of platelet and leukocyte in PRP between male and female were not significantly different (P > 0.05). The concentrations of PDGF, TGF-beta, and VEGF in PRP were (698.15 +/- 64.48), (681.36 +/- 65.90), and (1071.55 +/- 106.04) ng/mL, which were (5.67 +/- 1.18), (6.99 +/- 0.61), and (5.74 +/- 0.83) times higher than those in the whole blood, respectively. PDGF concentration (r = 0.832, P = 0.020), TGF-beta concentration (r = 0.835, P = 0.019), and VEGF concentration (r = 0.824, P = 0.023) in PRP were positively correlated with platelet concentration of PRP.
  
  
  CONCLUSIONS
  PRP with high concentrations of platelets, white blood cells and growth factors can be prepared stably by this package.
authors.affiliation: Department of Orthopedics, the Sixth People's Hospital, Shanghai Jiaotong University, Shanghai, 200233, P.R. China.
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Changqing
authors.initials: C
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Yuan
authors.forename: Shengbao
authors.initials: S
authors.lastname: Chen
authors.forename: Ruju
authors.initials: R
authors.lastname: Lü
mesh_terms: D000328:Adult; D000368:Aged; D020811:Biomedical Technology; D001792:Blood Platelets; D005260:Female; D006801:Humans; D007962:Leukocytes; D008297:Male; D008875:Middle Aged; D010956:Plasmapheresis / Q000379:methods*; D010976:Platelet Count; D053657:Platelet-Rich Plasma