Diagnostic accuracy measures assess a test's ability to distinguish between a disease and health. Key measures include sensitivity, specificity, likelihood ratios, area under the ROC curve (AUC), Youden's index, and diagnostic odds ratio (DOR). Sensitivity measures the proportion of true positives, while specificity measures the proportion of true negatives. Likelihood ratios (LR+) and (LR-) indicate how much a test result changes the probability of a disease. AUC reflects a test's overall discriminatory ability, with higher values indicating better performance. Youden's index is a global measure of a test's overall discriminative power. DOR compares the odds of a positive result in diseased versus non-diseased individuals. These measures are sensitive to disease prevalence, study design, and disease definition. Studies with poor methodology may over- or under-estimate test performance. The STARD initiative improved reporting standards for diagnostic accuracy studies. However, reporting quality still needs improvement. Authors should follow STARD guidelines to enhance the quality of diagnostic accuracy studies. Proper use of these measures ensures accurate interpretation and application of test results in clinical practice.Diagnostic accuracy measures assess a test's ability to distinguish between a disease and health. Key measures include sensitivity, specificity, likelihood ratios, area under the ROC curve (AUC), Youden's index, and diagnostic odds ratio (DOR). Sensitivity measures the proportion of true positives, while specificity measures the proportion of true negatives. Likelihood ratios (LR+) and (LR-) indicate how much a test result changes the probability of a disease. AUC reflects a test's overall discriminatory ability, with higher values indicating better performance. Youden's index is a global measure of a test's overall discriminative power. DOR compares the odds of a positive result in diseased versus non-diseased individuals. These measures are sensitive to disease prevalence, study design, and disease definition. Studies with poor methodology may over- or under-estimate test performance. The STARD initiative improved reporting standards for diagnostic accuracy studies. However, reporting quality still needs improvement. Authors should follow STARD guidelines to enhance the quality of diagnostic accuracy studies. Proper use of these measures ensures accurate interpretation and application of test results in clinical practice.