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The page below is a sample from the LabCE course Introduction to Quality Control. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Coefficient of Variation

The coefficient of variation is the ratio of the standard deviation to the mean. It is expressed as a percentage (%CV).
Like standard deviation, it is a measure of imprecision. The formula for %CV is

The CV provides a better estimate of method performance over a range of control concentrations than standard deviation.