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Calculator for EPV
Version 1.12
Revised: 20011210
You can calculate Etiologic Predictive Value (EPV) by entering:

The sensitivity of the test.

Theta, i.e. the relation between the proportion of positive tests in a healthy control population and in a population of symptomatic carriers. The value 1.0 is suggested and will be appropriate for most situations.

The number of positive and negative tests obtained in the group of symptomatic patients.

The number of positive and negative tests obtained in a healthy control population.
The numbers already filled in is an example of evaluating a throat culture used during summer season in children 315 years of age^{1}. Press “Calculate” to see EPV being calculated. Then alter the numbers to fit your situation and press “Calculate”.