The estimation of platelet count from blood smears must be systematic each time the automated count is erroneous because even the most expensive and most effective machine is not able to replace human judgement. Aim of the study was to estimate the platelet count indirectly by using the automated red blood cell (RBC) and calculating the platelet count on the basis of the red cell: platelet ratio in a stained blood film. In this study, we attempted to verify the reliability of this technique. The peripheral blood smear was examined to determine the platelet: RBC ratio. Using this value and the automated RBC count, estimation of platelet count was done. Platelet counts by this method were not significantly different from automated platelet counts.