Thăng Long, P. , Thị Hoa, N. , Thị Ngọc Hân, Đoàn . and Thị Ngọc Hiệp, N. 2022. APPLICATION OF SIX SIGMA METHODS IN QUALITY CONTROL OF BILAN LIPID TEST AND CALCULATION OF QUALITY GOAL INDEX RATIO. Vietnam Medical Journal. 518, 1 (Sep. 2022). DOI:https://doi.org/10.51298/vmj.v518i1.3350.