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HSS J. 2017 Feb;13(1):75-80. doi: 10.1007/s11420-016-9519-3. Epub 2016 Aug 19.

Commercial Separation Systems Designed for Preparation of Platelet-Rich Plasma Yield Differences in Cellular Composition.

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Sports Medicine and Shoulder Service, Hospital for Special Surgery, 535 East 70th Street, New York, NY USA.
Blue Tail Medical Group, St Louis, MO USA.



The role of platelet-rich plasma (PRP) in the treatment of sport-related injuries is unclear, largely due to the heterogeneity of clinical results. This may relate to compositional differences in PRP from different separation systems.


This study aims to compare the composition of PRP produced with five different commercially available systems, focusing on cellular concentrations and pH.


Seven donors (41 ± 12 years) provided blood for PRP preparation using five systems (Arthrex Angel, Emcyte Genesis CS, Arteriocyte Magellan, Harvest SmartPrep, and Biomet GPS III). Post processing, cellular composition was measured including platelets (PLT), white blood cells (WBC), neutrophils (NE), and red blood cells (RBC), as well as pH.


Platelet concentration and capture efficiency were similar between systems, except the Angel 7% preparation had a greater concentration than Genesis CS (2310 ± 524 vs. 1129 ± 264 k/μL). WBC concentration was variable between systems; however, significant differences were only found between the Angel 2% and GPS III preparations (11.0 ± 4.5, 27.3 ± 7.1 k/μL). NE concentration was significantly lower in the Angel 2% and 7% preparations compared with GPS III (0.6 ± 0.6 and 1.8 ± 1.3 k/μL vs. 9.4 ± 7.0 k/μL). RBC concentration was highest in SmartPrep (3.2 ± 0.6 M/μL) and Genesis CS systems (3.1 ± 0.6 M/μL) compared with all other systems (≤1.1 ± 1.2 M/μL). Finally, pH was significantly lower with the SmartPrep system (6.95 ± 0.06) compared with all others (≥7.26 ± 0.06).


Aside from platelet concentration and capture efficiency, significant compositional differences were identified between preparation systems. Caution should be employed when interpreting clinical results of studies utilizing PRP, as the role of compositional differences and their effect on outcome are unknown. Further study is necessary to determine the clinical significance of these differences.


cellular concentration; platelet-rich plasma; platelet-rich plasma separation system

Conflict of interest statement

Ryan M. Degen, MD, Johnathan A. Bernard, MD, and Kristin S. Oliver, MD have declared that they have no conflict of interest. Joshua S. Dines, MD reports personal fees from Arthrex, Conmed Linvatec and Ossur, outside the work. Human/Animal Rights All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5). Informed Consent Informed consent was obtained from all patients for being included in the study. Required Author Forms Disclosure forms provided by the authors are available with the online version of this article.

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