Medical Question of the Day- 32

A 57-year-old man with a history of bleeding per rectum visits his physician to discuss the results of his recent CT colpography test. The test was positive for the presence of a colorectal polyp. The sensitivity and specificity of this test to detect a colorectal polyp is 75% and 90% respectively.

What is the probability that this patient indeed has a colorectal polyp?

A – 92%

B – 90%

C – 88%

D – 86%

E – 84%


Positive predictive value of the test is the probability that a patient with a positive test indeed has a disease. This patient has a positive test. To estimate the PPV of the test we must draw a 2×2 table.

RPV = TP/all positive (TP+FP)

= 75/75+10

= 75/85

= 88%

The correct answer is C

We got 3 Correct answers. Drawing is done and the winner is Mina Shehata

Congratulations and better luck for all of you on next question

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19 thoughts on “Medical Question of the Day- 32”

  1. Thank you Dr Esan

  2. Thank you Dr Peter

  3. Thank you Dr Evans

  4. Thank you Dr Ajith

  5. Thank you Dr Shaili

  6. Thank you Dr Ehab

  7. Thank you Dr Mike

  8. Thank you Dr Mina

  9. Thank you Dr Ahmed

  10. Answer is 84

  11. 84%

  12. 84% The answer is E

  13. C 75/85 = 88%

  14. C -88%

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