There are two methods for counting RBCs; 1) Automated method through the electronic blood cells counter. 2) Manual method using the hemocytometer.
Electronic counter is more accurate than the hemocytometer method.
The electronic counter is expensive, needs periodical maintenance. Maintenance of blood counter is very important; failure to do that will result in misleading results.

https://www.youtube.com/watch?v=WXDjUgTNW9o

The hemocytometer method takes longer time, but it is cheaper, which make it suitable for a small laboratory.
Red blood cells count is expressed in million/cumm, or Tera/liter (T/l).

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