As a physician, what should you tell a woman after she has taken a test for It i

Question

As a physician, what should you tell a woman after she has taken a test for It is important for a woman to know if she becomes pregnant so that she can discontinue any activities, medications, exposure to toxins at work, smoking. or alcohol consumption that could be potentially harmful to the baby. Pregnancy tests like almost all health tests, do not yield results that are 100% accurate. In clinical trials of a blood test for pregnancy, the results shown in the table below were obtained for the Abbot blood test (based on data from Limit of Ten Pregnancy Tests," by Tiitinen and Stenman, Scandinavion Journal of Clinical Laboratory Investigation, Vol.53, Supplement 216. Specificity and Detection Pregnancy Test Results Positive Test Result Negative Test Result (Pregnancy is indicated) (Pregnancy is not indicated) Total Subject is pregnant Subject is not 85 15 100 80 12 pregnant Total 83 17 36. Based on the results in the table, what is the probability of a woman being pregnant given the test indicates a negative result? (a).850 (b).05 (c).294 (d).170 (e) 058 37. Based on the results in the table, what is the probability of a false positive? That is, what is the probability of getting a positive result given the woman is not actually pregnant? (a).83 (b).20 (c).03 (d).036 (e) 964 38. Based on the results in the table, what is the probability of a false negative? That is, what is the probability of getting a negative result given the woman is actually pregnant? (a) .059 (b) .294 (c)05 (d) 170 (e) .941

Explanation / Answer

36) women being pregnant and negative result

p(Pregnant|negative result) = 5/85 = 0.058

37) False positive

p(not pregnant|positive test) = 3/83 = 0.036

38) False negative

p(pregnant|negative test) = 5/17 = 0.294

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