Many recent studies have indicated that non-ionizing electromagnetic fields have an adverse health effects on human beings. This study evaluated the effects of low frequency electromagnetic field (LF - EMF) which is radiated by CRT TV/PC screen on blood cell of human beings. The data of incident fields are estimated by the magnetic fields which have been experimentally observed by W.T Kaune et al., (2000) and penetrated electric field & current density inside the blood cells are calculated. The estimated data are compared with the safety guidelines of different international agencies like International Commission of Non Ionizing Radiation Protection (ICNIRP) and World Health Organization (WHO). It is found that 50 cm distance and 90 cm height of CRT TV/PC screen is harmful for the life of blood tissues.