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Diagnostic Post Test Probability of Disease Calculator

Posttest probability is a type of subjective probability of a disease that turns out to be positive or negative depending on the result of the diagnostic test conducted. This online calculator computes the post test probability of a disease when the values of pretest probability and likelihood ratio are given

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Diagnostic Post Test Probability of Disease Calculation

Enter the value of pretest probability%
Enter the value of likelihood ratio+  -
For a positive diagnostic test, the post test probability is%
For a negative diagnostic test, the post test probability is%

  
   
  
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Just copy and paste the below code to your webpage where you want to display this calculator.


Formula:
O = p1 ( 1 - p1 ),
p2 = O * L,
p = p2 / ( 1 + p2 ),

 Where,
p1 is the pretest probability,
O is the pretest odds,
p2 is the posttest odds,
L is the likelihood ratio,
p is the posttest probability.