Post by Admin on Jan 24, 2016 22:57:35 GMT
A 55-year-old comedian from Arizona comes to the physician with an x-ray film of her chest taken during a routine health insurance examination. The x-ray film shows bilateral hilar adenopathy. The patient is completely asymptomatic. Sarcoidosis is suspected. He was told that his serum levels of angiotensin-converting enzyme (ACE) were elevated. The sensitivity and specificity of using ACE levels to test for the disease in question are 80% and 50%, respectively.
Assuming that sarcoidosis is highly prevalent in this patient's community, how would the patient's place of residence affect the positive predictive value (PPV) and negative predictive value (NPV) of the test?
A.
In areas of higher prevalence, both the PPV and the NPV are higher
B.
In areas of higher prevalence, both the PPV and the NPV are lower
C.
In areas of higher prevalence, the PPV is higher and the NPV is lower
D.
In areas of higher prevalence, the PPV is lower and the NPV remains the same
E.
Regardless of the prevalence, both the PPV and the NPV are unchanged
Assuming that sarcoidosis is highly prevalent in this patient's community, how would the patient's place of residence affect the positive predictive value (PPV) and negative predictive value (NPV) of the test?
A.
In areas of higher prevalence, both the PPV and the NPV are higher
B.
In areas of higher prevalence, both the PPV and the NPV are lower
C.
In areas of higher prevalence, the PPV is higher and the NPV is lower
D.
In areas of higher prevalence, the PPV is lower and the NPV remains the same
E.
Regardless of the prevalence, both the PPV and the NPV are unchanged