This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
Predictive value of a positive test is defined as- 
Select and explain. 
A. True+ve\/true+ve+false-vex100, B. True + ve\/ true + ve + false + ve x 100, C. False + ve \/ true + ve + false + ve x 100, D. False + ve \/ true + ve + false - ve x 100
B: True + ve\/ true + ve + false + ve x 100
Answer: B: True + ve\/ true + ve + false + ve x 100 
Explanation: Ref:Parks 23rd edition pg 140 PPV = TP / (TP +FP) * 100 Predictive value reflects the diagnostic power of a test.