Hey Folks!

Preventive & Social Medicine (Community Medicine) is a difficult branch to understand ... leave alone the aspect of liking it. Nonetheless, it is an important overarching medical subject encompassing clinical medicine, human behaviour, environment and many more.
Many students keep asking me a lot of exam questions again and again. The aim of this blog is to answer various queries and difficult concepts pertaining to this subject.
Do email me / comment if you find any mistakes or want answers to any particular qustion not listed here.
Enjoy!

Tuesday, June 2, 2015

The property of a test to identify the proportion of truly ill persons in a population who are identified as ill by a screening test is called

a. Sensitivity
b. Specificity
c. Positive Predictive Value
d. Negative Predictive Value


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Ans: a

Sensitivity = True Positive / Total Diseased
Specificity = True Negative / Total Not Diseased
Positive Predictive Value = True Positive / Total Tested Positive
Negative Predictive Value = True Negative / Total Tested Negative
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