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STANDARD ANALYTE in QC — The text defines STANDARD (standard substance) as used in formulating Quality Control charts. What is the definition of STANDARD?
A. Standard is a reference material issued by a national government body
B. STANDARD IS A SUBSTANCE OF CONSTANT COMPOSITION OF SUFFICIENT PURITY TO BE USED FOR COMPARISON PURPOSES OR STANDARDIZATION — examples include glucose and cholesterol
C. Standard is the same as control serum used in daily QC
D. Standard refers only to certified reference materials from NIST
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