Percent Laboratory Test Interference

Any number of things can interfere with a test result. The significance of any interference needs to be determined.

Parameters:

(1) true value

(2) measured value

(3) cutoff percent for a significant interference (often 10%)

Because the units cancel out the implementation is dimensionless.

percent interference =

= ((measured value) – (true value)) / (true value) * 100%

If the absolute value for percent interference is greater than the cutoff percent, then it is termed significant.

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