In the clinical decision flow, which step immediately follows the test?

• A. Posttest probability
• B. Likelihood ratio
• C. Treat
• D. Pretest probability

Answer: (B)

Right after you obtain the test result, you use the test’s likelihood ratio to update your estimate of how likely the disease is. The likelihood ratio quantifies how much the test result changes your odds of disease, converting your pretest probability into a posttest probability. This updated probability is what then guides whether you proceed with treatment. So the step immediately after the test is applying the likelihood ratio to adjust the probability; the posttest probability is the result of that adjustment, and treatment follows from that updated probability. The pretest probability is what you had before testing, not the immediate post-test step.