5 Procedure A finger is lanced and small amount of blood is allowed to accumulate Blood is drawn into the pipette Fill blood into red pipette at 0.5 mark. Fill reagent add up into the pipette to 101 mark. Shake the pipette on the vibrator for 1 min.
Procedure Discarded the first 3-4 drops. Fill in the hemacytometer nicely. Allow RBC to set down for 2-3 min. Count 5 red squares under microscope Calculate the RBC concentration. 6
7 RBC Count (cont.) Counting 1. Count in 5 red cell squares in the middle (In 4 squares at corners and another 1 in the middle). 2. Top-left touching count 3. Using counter hand tally or hand tally
8 RBC Count (cont.) 0.2 mm. W W R R 1 mm. R 0.2 mm. R R W W High 0.1 mm. 3 mm.
9 RBC Count (cont.) Top Left
10 RBC Count (cont.) Calculation Red cell count = number of cells counted (N) x volume factor (=50) x dilution factor (=200) = N x 10,000 Normal range = 3.8 - 6.0 x 106 / cu.mm.
Decrease in RBC Burns Pregnancy Anemia Iron deficiency Vit B12 Bone marrow damage 11