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Volume 2 (2002), Pages 1540-1543
Peer-Reviewed Protocol

Separation of Monocytes from Whole Human Blood

School of Biomolecular Sciences, Liverpool John Moores University, UK

Received 7 March 2002; Revised 14 May 2002; Accepted 15 May 2002

Copyright © 2002 John Graham.


Human peripheral blood monocytes are isolated by flotation from whole blood through a single low-density barrier prepared from OptiPrep™ at 4°C. The separation from lymphocytes depends on the more rapid rate of flotation of the monocytes because of their slightly lower density and larger size. The method works optimally only with fresh (within 2 h of drawing) EDTA-anticoagulated blood. Preliminary evidence suggests that this technique may be applicable to blood from rats.