While the transplant is happening, there can be a dip in your blood cells (WBCs, RBCs, PLTs). This is why blood counts are monitored closely during the transplant. Before the transplant, your complete blood count or CBC is monitored for some weeks. The CBC gives information on the count of white blood cells (WBCs), red blood cells (RBCs), and platelets in your blood. The ideal WBC count should be between 4,000 and 10,000. If your WBCs fall below 1,000 then it can cause complications. The measurement values for RBCs are hemoglobin (Hgb) and hematocrit (Hct). Hgb should be somewhere between 14 and 18 and Hct should be somewhere between 37 and 52. In case of platelets, the count should be between 150,000 and 400,000.