7 mgdl and the acceptable range between 495 mgdl and

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one standard deviation being 0.7 mg/dl and the acceptable range between 4.95 mg/dl and 7.75 mg/dl. The QC 3 value was 9.734 mg/dl which beyond three standard deviations. Since QC values are considered acceptable when within two standard deviations above or below the mean, and the QC values obtained exceed the 2 standard deviation control limit, the results should be rejected. So since the QC results did not fall within two standard deviations of the reference ranges, the patient results cannot be verified and given to the doctor. However, if the QC results did fall within two standard deviations of the reference ranges, the creatinine concentration would have been abnormal, for desirable creatinine levels are 0.40 mg/dl – 1.40 mg/dl and the patient sample contained 3.617 mg/dl of creatinine. If the results were to have been acceptable and the creatinine concentration obtained was too high, the results would have been indicative of kidney disease. The variability in the QC results could have been indicative of errors performed during the analysis. Perhaps, there were measurement errors with the reagent volumes or pipetting errors which resulted in the Westgard rule violations. Or perhaps, the cuvettes and the pipettes were unclean.
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