You can make a very good estimate if you use labelled beads to control the volume. Then if you have say 1000 beads per ml you can work out your cell number. Coulter happen to do beads for this very purpose. Craig. ++++++++++++++++++++++++++++++++++++++++++++++++++++++ This e-mail is that of the sender, and does not necessarily represent the views of the NBS. The National Blood Service Do something amazing today. Save a life. Give blood. Please call 0345 711 711 for details, or visit our web site at http://www.bloodnet.nbs.nhs.uk ++++++++++++++++++++++++++++++++++++++++++++++++++++++
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