Determination of the sensitivity and specificity of two tests for antinuclear antibodies (ANA) in the diagnosis of systemic lupus erythematosus. Methods: Descriptive cross-sectional study. The ANA test was performed on 70 patients with systemic lupus erythematosus diagnosed and treated at the University of Medicine and Pharmacy hospital during the period from 2021 to 2022. Results: Antinuclear antibody (ANA) test was performed on a total of 70 patients diagnosed with systemic lupus erythematosus with age from 17 to 63 (mean 35,6 ± 11), of which 63 were female patients (90%) and 7 male patients (10%). Specificity was 100% with both methods, but immunofluorescence was more sensitive than ELISA (95,7% vs 80%, respectively). Simultaneously, fluorescent ANA provides additional concentrations and patterns of fluorescence deposition. The most common deposition patterns of patients with systemic lupus erythematosus were speckled pattern (61,4%) and homogenous pattern (12,9%). Conclusion: performing ANA test is necessary for patients with systemic lupus erythematosus to help diagnose the disease accurately and improve the quality of treatment. In which, indirect immunofluorescence technique helps to detect specific antibodies with higher sensitivity and specificity than traditional ELISA methods.