Diagnostic accuracy refers to the ability of a diagnostic test or procedure to correctly identify or rule out a particular condition or disease in a patient. This research area focuses on evaluating the sensitivity, specificity, positive predictive value, and negative predictive value of diagnostic tests, as well as assessing their overall accuracy in diagnosing various medical conditions. Researchers in this field work to develop and validate new diagnostic tests, improve existing tests, and determine the most effective ways to use these tests in clinical practice. Their goal is to help healthcare professionals make accurate and timely diagnoses, leading to better patient outcomes and more efficient healthcare delivery.