Medical MCQ-Calculate Sensitivity and Specificity of ELISA in a population screened for HIV. Data is given below HIV Present HIV Absent ELISA +ve 80 40 ELISA -ve 20 60

Calculate Sensitivity and Specificity of ELISA in a population screened for HIV. Data is given below HIV Present HIV Absent ELISA +ve 80 40 ELISA -ve 20 60

60%, 80%

80%, 60%

66.6%, 75%

75%, 66.6%

Question Category:

Social & Preventive Medicine

Correct Answer:

80%, 60%

Description:

HIV Present HIV Absent ELISA + ve 80 = a 40 =b ELISA -ve 20 = c 60 =d Sensitivity = a/a+c x 100 = 80/100 X 100 = 80% Specificity = d/ b+d x 100 = 60/100 X 100 = 60% PPV 80/120 X 100 = 66% NPV 60/80 X 100 = 75%

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