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Ongena, K., Das, C., Smith, J. L., Gil, S., Johnston, G. Determining Cell Number During Cell Culture using the Scepter Cell Counter. J. Vis. Exp. (45), e2204, doi:10.3791/2204 (2010).
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do hemocytometer used to less or over-estimate cell conc. when it is employed to detect too low/ high conc. of cells when it is compared to the scepter?
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Hemocytometers can under or over estimate cell concentrations depending upon the user and their defined counting scheme. Furthermore because only a small fraction of cells are counted (on average 100-200) any errors are magnified by scaling and dilution factors resulting in CVs up to 30% and on average around 17%.
Sources of under or over counting, include improper loading, user bias as to whether something is counted as a cell or not a cell, counting or not counting cells that fall on the line, contamination of the hemocytometer, inconsistent conventions for counting.
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ReplyPosted by: NazNovember 30, 2010, 3:26 PM