Q.Write the normal values of total RBC and WBC

Step 1. A total RBC or WBC count, obtained by diluting blood with the appropriate fluid (Hayem's fluid for RBCs, Turk's solution for WBCs) and counting under the microscope with a haemocytometer, is reported as the number of cells per cubic millimetre (mm3) of blood.

Step 2. The accepted normal reference range for total red blood cells in a healthy adult is approximately 4.5 to 5.5 million cells per mm3 of blood - red cells being by far the most numerous formed element in blood, which is what makes the haemocytometer's RBC grid finer (25 tertiary squares) than its WBC grid.

Step 3. The accepted normal reference range for total white blood cells in a healthy adult is approximately 4,000 to 11,000 cells per mm3 of blood - far fewer than red cells, consistent with WBCs being counted over the coarser corner squares of the haemocytometer grid. …

State the standard clinical reference ranges for total RBC and total WBC counts, as …

• Quoting the WBC differential percentages (e.g. neutrophil 50-70%) instead of the total WBC count in cells/mm3 - these are two different measurements. …