WBR0793
Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
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Exam Type | ExamType::USMLE Step 1 |
Main Category | MainCategory::Biostatistics/ Epidemiology |
Sub Category | SubCategory::Cardiology, SubCategory::Reproductive |
Prompt | [[Prompt::A new urine pregnancy test is being studied before being distributed to pharmacies. A trial is conducted to compare the results of this new test to a combination of imaging and blood HCG levels to validate the pregnancy. A table showing the results of the study are shwon below. What is the probability that a woman is really pregnant if her urine pregnancy test result comes back positive? |
Answer A | AnswerA::85.71% |
Answer A Explanation | AnswerAExp::This refers to the sensitivity. |
Answer B | AnswerB::75% |
Answer B Explanation | AnswerBExp::This refers to the positive predictive value. |
Answer C | AnswerC::89.28% |
Answer C Explanation | AnswerCExp::This refers to the NPV. |
Answer D | AnswerD::80.64% |
Answer D Explanation | AnswerDExp::This refers to the specificity. |
Answer E | AnswerE::62% |
Answer E Explanation | AnswerEExp:: |
Right Answer | RightAnswer::B |
Explanation | [[Explanation::The positive predictive value is the probability that a person really has a condition if his test result is positive. The calculation is shown below. |
Approved | Approved::No |
Keyword | WBRKeyword::Positive predictive value |
Linked Question | Linked:: |
Order in Linked Questions | LinkedOrder:: |