Urine hCG tests are commonly used to determine if someone is present. Urine preg
ID: 142002 • Letter: U
Question
Urine hCG tests are commonly used to determine if someone is present. Urine pregnancy tests qualitatively detect the presence of hCG in the urine. While manufacturers often state that the tests have 99.99% accuracy, they are typically referring to the accuracy of the test in a patient who has a markedly elevated urine hCG. The table below contains data based on a population of women who are only a few weeks into their pregnancy.
Pregnant?
Positive urine hCG
Negative urine hCG
Total
Yes
32
8
40
No
5
143
148
Total
37
151
188
Use the information in the table to answer the following questions:
2. Determine the predictive value of a positive urine hCG test
Pregnant?
Positive urine hCG
Negative urine hCG
Total
Yes
32
8
40
No
5
143
148
Total
37
151
188
Explanation / Answer
predictive value for positive urine hCG test will be calculated as
percent of pregnancy when positive urine hCG test divided by total test of positive urine hCG test
32/37 = 0.86
0.86 x 100 = 86 %
Therefore the predictive value of positive urine hCG test is 86%
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