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Defining Accuracy and Precision

For a smooth-running operation

George Rodrigues
Wed, 12/17/2008 - 09:36
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Body

Liquid delivery is a common laboratory process and this critical function is often overlooked. As a result, routine research and test results can be in error based on a simple misunderstanding or misapplication of liquid delivery instruments. This article focuses on defining and exploring accuracy and precision, which are fundamental elements of regulatory compliance.

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As an example of the importance of accuracy and precision, in January 2007, the Food and Drug Administration (FDA) sent out more than 1,000 letters to drug product owners regarding a “lack of assay reproducibility between original and repeat results,” and in a related warning letter stated that because of lack of reproducibility “the reported concentration results cannot be considered accurate.” The laboratories involved have spent many thousands of hours and tens of millions of dollars responding to this situation. These sorts of events grab headlines and create excitement, but most of us prefer a less thrilling work experience.

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Comments

Submitted by Anonymous (not verified) on Fri, 05/04/2018 - 09:52

Precision and inaccurate

Dear Sir,

The information is very usefull.

We are currently using the WG rules and the LJ chart to monitor the precision and accracy of an analysis. Our new colleageu is having bias results. 6 measurants at the same condition are under the mean. The results are precisly, but not accurate. After repeating, the precision and inaccuracy remained. The procedures had been followed correctly by the new colleageu after evalutaion. What action would you advise about the results?

Looking forward receiving your feedback. Thank you in advance.

Kind regards

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