Using a Cell Counter

Credit: Keohane, E. M., Smith, L. J., & Walenga, J. M. (2020). Rodak’s hematology: Clinical principles and application (6th ed.).  Elsevier. p.243.
  • Each cell counter has a series of buttons that correlate with each cell type, indicated along the top of the counter.
  • As you count the WBC’s, use the counter to keep a track of the different cells being counted in each field until 100 consecutive WBC’s have been counted.
  • Once you count 100 consecutive cells the counter will ring, indicating that you are done.
  • Each window represents the percentage of specific cells being counted and the total number of WBC’s cell counted is indicated on the last window on the right side of the counter.
  • You must press firmly on these buttons to ensure that all the cells are being numerated properly.
  • The ringer on some counters may not work so it is good to glance at the total occasionally to ensure that you don’t go over 100.
  • Always use your left hand to count the cells on the counter, and your right hand to maneuver the microscope stage.  These are right-handed microscopes.
  • Once you have counted 100 consecutive WBC’s, document the percentage of each cell on the worksheet provided.

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