Professor Dr. Kovit Pattanapanyasat, Head of Center of Excellence of Flow cytometry, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University was rewarded 21st Science and Technology award for 400,000 Baht by Thailand Toray Science Foundation on 9th March 2015. Professor Dr. Kovit Pattanapanyasat is over 25 years expertise in flow cytometry application for immunology, Thalassemia and infectious diseases such as Malaria, Dengue virus and HIV/AIDS. Moreover, he developed CD4 Lymphocyte measurement to be high quality, standardize and low cost, for examples, BioLeucotag and Biobeads. Inevitably, WHO and Thailand MOPH U.S. CDC Collaboration have an honorary Professor Dr. Kovit invitation to be a committee to assess the efficiency of flow cytometry and he pushed External Quality Assurance/EQA in Thailand for CD4 measurement.