Abstract: This paper presents the critical review of the literature starting from a Global Perspective of Health Informatics, the Health Informatics situations in Kenya, factors Influencing Health Informatics Adoption, Health Informatics Privacy and Security, Biometric Feature in Wireless Body Area Network. The paper also addresses Health Informatics Ethical Issues, ethical concern with Information Technology Performance, health Workers Personality Traits, theoretical models, comparison of Theories used in this Research. Ethical issues Associated with Adoption of Health Information System and then the Conceptual Model.