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qualitycontrol-137
LEVEY-JENNING CHART PATTERNS — The text describes DRIFT in QC values. What does DRIFT indicate in the context of Levey-Jenning charts?
A. A single outlier value far from the mean
B. Values suddenly shifting to all high or all low
C. THE CONDITION OF VALUES GRADUALLY MOVING AWAY FROM THE MEAN LINE OVER A PERIOD OF TIME — indicating a slow progressive change in the analytical system
D. Random scatter of values around the mean
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