Mahdi H. A. Abdalla (PhD), 1Idris M. M. Hamid, 2 Rashad M. O. Mahmoud, 1Ghada M. Merghani and 2*, 1Faculty of Medical Laboratory Sciences, Alneelain University, Sudan 2Department of Haematology, Faculty of Medical Laboratory Sciences, Omdurman Ahlia University, Sudan, Sudan