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Diagnostic test evaluation and comparison

Probability of infection in a test-negative sample


Use this to calculate the probability that a sample of test-negative animals will include one or more infected individuals, given that they come from a popuation infected at a given design prevalence and the specified test sensitivity and specificity. Also calculated is the probability that all animals in the sample will test negatively. Results are calculated for the specified design prevalence as well as for a range of prevalence values.


This site was created by Ausvet with funding from a range of sources. It provides a range of epidemiological tools for the use of researchers and epidemiologists. Please submit any comments, questions or suggestions here.