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MRCOG PART 1 - IMMUNOL, MEDICAL PHYSIC & STATS

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MRCOG July 2018 Theme

MRCOG July 2018 Theme Posted by Farrukh G.

A study is undertaken to evaluate a new bed-side test for Group B streptococcus using culture as the gold standard. 1000 women are tested and there are 250 positive tests, of which 200 are positive on culture and 750 negative tests of which 25 are positive on culture. What is the negative predictive value of the new test?

A) 99%

B) 97%               

C) 94%

D) 89%

E) 84%