Question

Diagnostic power of a test to correctly diagnose a disease is ?

• A. Negative predictive value
• B. Positive predictive value
• C. Sensitivity
• D. Specificity

Answer 1

The Correct Option is B

In the medical field, the diagnostic power of a test refers to its ability to correctly identify the presence or absence of a disease. Several metrics are used to evaluate this, including:

• Positive Predictive Value (PPV): This is the probability that subjects with a positive screening test truly have the disease. It measures the power of a test to correctly diagnose the disease when the test result is positive.
• Negative Predictive Value (NPV): This is the probability that subjects with a negative screening test are truly free of the disease.
• Sensitivity: This is the ability of a test to correctly identify patients with a disease (true positive rate).
• Specificity: This is the ability of a test to correctly identify patients without the disease (true negative rate).

The correct measure of a test's power to diagnose a disease accurately when the test result is positive is the Positive Predictive Value (PPV).