In medical diagnosis, the hospitals and medical laboratories in Vietnam use the reference intervals researched from European, which are not suitable with the Asian in general and with the Vietnamese in particular. With the aim step by step researching and setting up the reference intervals for the Vietnamese in the future, Center for Standardization and QC in Medical Lab of Ho Chi Minh city had a collaboration with Yamaguchi University (Japan) in the research "Study of regionality in laboratory test results and collaborative derivation of reference intervals in Asianin 2009". After finishing this study successfully, the authors recognize that it is necessary to do the study of surveying, evaluating the situation of reference intervals of hematology, coagulation which are using at medical laboratories, so that the scientists, the policymakers have more essential informations to do other studies, or to set up policies, that help to improve the quality of medical diagnosis.