Klapperich Lab:Cell Counting Procedure

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How to count cells using Hemocytometer.


  • PBS
  • trypan blue soln.


  1. Aspirate media.
  2. Wash with 1X PBS.
  3. Aspirate PBS.
  4. Resuspend in media – make sure cells are completely resuspended, that they are not clumped together.
  5. Place coverslip on middle of hemocytometer.
  6. remove 500 ul of cells to microfuge tube.
  7. Add 50 ul of cell solution to 50 ul of trypan blue solution in a second microfuge tube.
  8. Add 20 ul of the final solution to each side of the hemocytometer. by letting a drop of liquid get taken into the slid by capillary action.
  9. Place hemocytometer on scope at 10X magification
  10. Locate center 5 x 5 grid.
  11. Move to higher power.
  12. Count all of the viable cells in the 5 x 5 grid. It is easier to count at higher power. Dead cells will be dark blue.
  13. Count the cells in two other 1 mm2 areas (one of the squares surrounding the center square).
  14. Average the values for the final count.


  1. List troubleshooting tips here.
  2. You can also link to FAQs/tips provided by other sources such as the manufacturer or other websites.
  3. Anecdotal observations that might be of use to others can also be posted here.

Please sign your name to your note by adding ('''~~~~''') to the end of your tip.


Relevant papers and books

Error fetching PMID 6947258:
Error fetching PMID 13718526:
  1. Error fetching PMID 6947258: [Goldbeter-PNAS-1981]
  2. Error fetching PMID 13718526: [Jacob-JMB-1961]
  3. Mark Ptashne. A genetic switch. Cold Spring Harbor, N.Y.: Cold Spring Harbor Laboratory Press, 2004. isbn:0879697164. [Ptashne-Genetic-Switch]
All Medline abstracts: PubMed HubMed


  • Who has experience with this protocol?
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