Enter the true negative rate and the false negative rate into the calculator to determine the negative predicted value.
Negative Predictive Value Formula
The following formula is used to calculate a negative predictive value.
NPV = TNR / (TNR + FNR)
- Where NPV is the negative predictive value
- TNR is the true negative rate
- FNR is the false negative rate
FAQ
A negative predictive value is the probability or change that people who get a negative test result, actually do not have whatever was being tested for. In other words, it’s a measure of how accurate a given test is.
A positive predictive value is the probability that you actually have a disease given a positive test results.
Example
How to calculate negative predictive value?
- First determine the true negative rate.
Calculate the rate at which a true negative test results is found.
- Next, determine the false negative rate.
Calculate the rate at which a negative test results in a false negative.
- Finally, calculate the negative predictive value.
Using the formula, calculate the NPV.
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