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AWEsome Risk Calculator

Use this interactive calculator to model the risk and cost of false laboratory tests based on the prevalence of true positive samples, Percent Positive Agreement (PPA, sensitivity), and Percent Negative Agreement (PNA, specificity) of the test.

Image of calculator

It’s interactive! Select tests and change values if you like.


In the graphs, you can toggle any of the series off or on. This is helpful to understand the impact of prevalence, PPA, and PNA on both absolute numbers and probabilities.

You can also toggle costs off and on, change the values and currency symbol.

We hope laboratory scientists, researchers, teachers, and math-nerds will find this calculator useful.

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