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WESTGARD RULES — What does the REJECTION RULE 2₂s indicate?
A. One control observation exceeding mean ± 2SD — warning of random error
B. TWO CONSECUTIVE CONTROL OBSERVATIONS BOTH EXCEEDING THE SAME MEAN + 2SD OR MEAN − 2SD LIMIT — indication of SYSTEMATIC ERROR
C. Range between two controls exceeding 4SD
D. Two observations both exceeding ±3SD
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