SPM – MCQ 52 – Post test probability

Collection of Medicine MCQs (Cardiovascular system) for medical students. Concept based MCQs with detailed explanations which help students to gain valuable insights and gain an edge in competitive examinations. More than just answering MCQs, the explanations will improve the knowledge and understanding about the conditions discussed. Also useful for MD students who are preparing for Superspeciality entrance examinations. Medicine MCQs - Cardiovascular System Kindle Edition: Click Here for a Preview. Comments and suggestions are most welcome.

You have diagnosed a patient clinically as having SLE and ordered 6 tests. Out of which 4 tests have come positive and 2 are negative. To determine the probability of SLE at this point, you need to know:
a) Prior probability of SLE; sensitivity and specificity of each test
b) Incidence of SLE and predictive value of each test
c) Incidence and prevalence of SLE
d) Relative risk of SLE in this patient

Correct answer : a) Prior probability of SLE; sensitivity and specificity of each test

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