# Calculating predictive values of positive tests

Please give details to solve the following question:

Calculate the value based on this information. A new screening test for Lyme disease is developed for use in the general population. The sensitivity (ability to identify infected persons) is 60% and specificity (ability to identify non- infected persons) is 70%. 300 people are screened (assume the true prevalence of Lyme disease is 10%) The predictive value of a positive test is:

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#### Solution Preview

Since the sensitivity is 60% and specificity is 70%, we can make use of the following table for all calculations:

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#### Solution Summary

The solution gives detailed steps on computing predictive value of a positive test. All formula and calcuations are shown and explained.

$2.19