The efficacy of new screening test for HIV has been assessed by comparing agains

Question

The efficacy of new screening test for HIV has been assessed by comparing against existing gold standard test for detection of HIV RNA via PCR. The study included I,ooo patients comprising of 820 HIV-negative patients confirmed on PCR. Out of 820 HIV negative patients confirmed on PCR, 60 were tested positive with the new screening test, whereas, 5o patients were tested negative on a new screening test. Based on these results calculate sensitivity, specificity, PPV and NPV for this new screening test and explain these results? (2 points for drawing contingency table and 8 points for calculations and explanations)

Explanation / Answer

Predicted Actual Positive Negative Positive 130 50 180 Negative 60 760 820 Senstivity= True Positive Rate 72% Specificity=True Negative Rate 93% PPV= True Positive/(True Positive+False Positive) 68% NPV= true Negative/(True Negative+Flase Negative) 94%

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.