Medical MCQ-Calculate the specificity of the screening test: Screening test results Diseased Not diseased Total Positive 400 200 600 Negative 100 600 700 Total 500 800 1300

Calculate the specificity of the screening test: Screening test results Diseased Not diseased Total Positive 400 200 600 Negative 100 600 700 Total 500 800 1300

70 per cent

75 per cent

80 per cent

85 per cent

Question Category:

Social & Preventive Medicine

Correct Answer:

75 per cent

Description:

Specificity is the ability of a test to identify correctly those who do not have the disease, that is, the percentage of "true negatives" among those not diseased. In the above question, there are 600 true negatives among 800 who are not diseased. Hence, the specificity is (600/800)x100 = 75 per cent. Ref: Park's Textbook Of Preventive And Social Medicine, By K. Park, 19th Edition, Pages 118, 119.

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