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Inaccuracy = Bias = (Laboratory Value - True Value)

Inaccuracy % = Bias % = [(Laboratory Value - True Value) x 100] / True Value

True Value may be “EQAS Mean of Comparison”.

Imprecision = CV% = (IQC-SD x 100 / IQC-Mean)

Total Error % (TE % ) = (Bias % + 2CV%)

Total Error (TE) = (Bias + 2SD)