What performance does a test with 100% specificity exhibit?

A test with 100% specificity means that it correctly identifies all individuals who do not have the condition, leading to no false positives. This characteristic is essential in clinical settings, particularly for conditions where it is crucial to rule out a diagnosis before proceeding with further testing or treatment.

When a test achieves this level of specificity, it effectively ensures that anyone who receives a negative result is indeed free from the condition being tested. Thus, false positives are entirely eliminated, giving healthcare providers and patients more confidence in the results. This aspect of specificity is vital for screening tests or diagnostic procedures that aim to minimize the chances of misdiagnosis.

In contrast, specificity does not provide information about how well the test identifies those with the condition (true positives), nor does it reflect the overall reliability of the test. Hence, the other options do not accurately capture the function of a test with 100% specificity.