Likelihood ratios combine sensitivity and specificity to indicate:

A Treatment effectiveness

B How much a test result changes the probability of disease — positive LR increases and negative LR decreases probability

C Prevalence

D Cost-effectiveness

✓ Correct Answer: Option B

LR+: sensitivity/(1-specificity) — how much positive result increases disease probability. LR-: (1-sensitivity)/specificity — how much negative result decreases probability. Use with Fagan nomogram.

💡 Why is B) the correct answer?

The correct answer to the question "Likelihood ratios combine sensitivity and specificity to indicate:" is Option B: How much a test result changes the probability of disease — positive LR increases and negative LR decreases probability.

The other options — A) Treatment effectiveness, C) Prevalence, D) Cost-effectiveness — are incorrect for this USMLE Exam Prep question. As explained above: LR+: sensitivity/(1-specificity) — how much positive result increases disease probability. LR-: (1-sensitivity)/specificity — how much negative result decreases probability. Use with Fagan nomogram.

📚 About This USMLE Exam Prep Practice Question

This 3-level USMLE Exam Prep question from the Step 3 - Clinical Practice topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free USMLE Exam Prep practice test or use flashcards for spaced repetition review.

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Likelihood ratios combine sensitivity and specificity to indicate:

✓ Correct Answer: Option B

📚 About This USMLE Exam Prep Practice Question

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