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qualitycontrol-282
INTERNAL QC — The text describes VARIOUS WAYS OF MAINTAINING INTERNAL QC including a specific approach using PRIMARY STANDARDS. What specific practice is described regarding primary standards in each batch of unknown specimen analysis?
A. A primary standard is only used once per week
B. AT LEAST ONE PRIMARY STANDARD IS INCLUDED WITH EACH BATCH OF UNKNOWN SPECIMEN ANALYSIS; occasionally a different primary standard of higher concentration is included to check the reliability of the routine primary standard
C. Primary standards are only used when QC failures occur
D. Primary standards are only used for initial method validation
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