Evaluation of screening test is by-
**Core Concept**
Screening tests are used to identify individuals at risk of a disease or condition, allowing for early intervention and potentially better outcomes. The evaluation of a screening test involves assessing its ability to accurately detect disease in a population.
**Why the Correct Answer is Right**
The evaluation of a screening test is typically done using the following criteria:
- **Sensitivity**: The ability of the test to correctly identify those with the disease (true positive rate).
- **Specificity**: The ability of the test to correctly identify those without the disease (true negative rate).
- **Positive Predictive Value (PPV)**: The probability that a person with a positive test result actually has the disease.
- **Negative Predictive Value (NPV)**: The probability that a person with a negative test result does not have the disease.
**Why Each Wrong Option is Incorrect**
**Option A:**
- This option is vague and does not specify any particular criteria for evaluating a screening test.
**Option B:**
- While this option mentions one aspect of test evaluation, it does not provide a comprehensive approach.
**Option C:**
- This option seems to be a combination of different concepts, but it is not a standard method for evaluating a screening test.
**Clinical Pearl / High-Yield Fact**
When evaluating a screening test, it is essential to consider the **prevalence** of the disease in the population being tested, as this can significantly impact the PPV and NPV of the test.
**Correct Answer: C. Sensitivity, specificity, PPV, and NPV.**