**Question:** More false positive cases in a screening test is due to -

A. Test sensitivity being too high
B. Test specificity being too low
C. Small sample size
D. Test being used in a non-target population

**Core Concept:**
In medical screening tests, a false positive result occurs when a person tested is mistakenly identified as positive even though they are actually healthy or have the disease in a mild or asymptomatic stage. Understanding the reasons behind false positive results is crucial for proper patient management and reducing unnecessary interventions and costs.

**Why the Correct Answer is Right:**
The correct answer (B) is right because a test with high sensitivity (ability to detect true positive cases) may generate more false positives. As the test detects even minimal disease presence, more false positives are expected. A test with high specificity (ability to correctly identify true negative cases) would result in fewer false positives.

**Why Each Wrong Option is Incorrect:**
A. Test sensitivity being too high (A) is incorrect because high sensitivity does not directly cause false positives. The issue lies with specificity.
C. Small sample size (C) does not directly influence false positive rates; rather, it affects the overall accuracy and reliability of the test results.
D. Test being used in a non-target population (D) can lead to lower specificity, but it does not solely explain false positives. False positives are mainly caused by a test's sensitivity and specificity.

**Clinical Pearl:**
A false positive result can cause unnecessary anxiety, interventions, and costs for the patient and healthcare system. Proper test selection, validation, and application are essential to minimize false positives and maintain test reliability. In clinical practice, combining multiple tests with complementary specificity and sensitivity characteristics can help reduce false positives. Utilizing a confirmatory test after a screening test can also help minimize false positives and increase diagnostic accuracy.