SETTING BOTH PARAMETERS OF THE INTERNAL QUALITY CONTROL CHART: A FLOOR-CEILING IMPRECISION CORRIDOR FOR CONTROL LIMITS AND EXTERNAL QUALITY ASSESSMENT FOR THE MEAN - A STUDY OF 24 CLINICAL CHEMISTRY ASSAYS. YHCĐ [Internet]. 2026 Sept. 19 [cited 2026 Sept. 19];67(CD14). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/6489