[5] She received her primary education at The Play Pen Child Development Centre in Port Harcourt and her secondary education at the University Demonstration Secondary School, University of Port Harcourt.
After completing her medical degree, she commenced her internship at the Braithwaite Memorial Specialist Hospital of the Rivers State University in Port Harcourt.
She proceeded to get a degree in International Health Management at the Imperial College Business School of the Imperial College London after the completion of her National Youth Service with the National Youth Service Corps.
Dr Oreh also holds a master's degree in Public health from the London School of Hygiene & Tropical Medicine.
[6] After the completion of her master's degree she volunteered with the Federal Ministry of Health for about seven months, and then she was appointed Programme Coordinator of the Abuja Centre of the National Blood Transfusion Service – a partnership project of the United States Centers for Disease Control and Prevention (CDC) and Nigeria's Federal Ministry of Health funded under the United States President's Emergency Plan for AIDS Relief (PEPFAR).