text: English
  
  # Diagnostic Test Calculator
  
  The diagnostic test evaluation is a method to evaluate the chances of being affected with diseases, calculated based on the present health conditions. In the below Diagnostic Test Calculator, enter the values for the true positive and false negative values for Disease Present category and False positive and true negative for disease absent category and click calculate to evaluate the medical diagnosis factors such as Sensitivity, Specificity and other values.
  
  ## Medical Diagnosis Evaluation | Calculator for Sensitivity
  
  Disease
  TestPresentAbsentTotal
  PositiveTrue Positive False Positive
  NegativeFalse Negative True Negative
  Total
  %
  %
  %
  %
  %
  %
  %
  
  The diagnostic test evaluation is a method to evaluate the chances of being affected with diseases, calculated based on the present health conditions. In the below Diagnostic Test Calculator, enter the values for the true positive and false negative values for Disease Present category and False positive and true negative for disease absent category and click calculate to evaluate the medical diagnosis factors such as Sensitivity, Specificity and other values.
  
  #### Formula:
  
  Sensitivity = a / (a + b) x 100 Specificity = c / (d + c) x 100 Positive Likelihood Ratio = (Sensitivity / 100) / (1-(Specificity / 100)) Negative Likelihood Ratio = (1- (Sensitivity / 100)) / (Specificity / 100) Disease Prevalence = (a + b) / (a + b + d + c) x 100 Positive Predictive Value = Sensitivity / (Sensitivity + d) x 100 Negative Predictive Value = c / (b + c) x 100
  Where, a = True Positive b = False Negative c = True Negative d = False Positive
  
  #### Example
  
  When a patient have disease number with true positive value of 10, false negative value of 5, non disease number with false positive value of 40 and true negative value of 45. His/her medical diagnostic test evaluation will be as follows,
  
  Sensitivity = 10 / (10 + 5) x 100
  = 66.67%
  Specificity = 45 / (40 + 45) x 100
  = 52.95
  Positive Likelihood Ratio = (66.67 / 100) / (1-(52.9 / 100))
  = 1.42%
  Negative Likelihood Ratio = (1- (66.67 / 100)) / (52.9 / 100)
  = 0.63
  Disease Prevalence = (10 + 5) / (10 + 5 + 40 + 45) x 100
  = 15%
  Positive Predictive Value = 66.67 / (66.67 + 40) x 100
  = 20%
  Negative Predictive Value = 45 / (5 + 45) x 100
  = 90%
  
  ## Related Calculators:
  
  Note :This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.
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