We used contingency table and performed a fishers exact test to test the hypothesis, if a patient with SLE tests for thiols (cutoff ≤90.90 μmol/L), creatinine (cutoff >1.10 mg/dL) and C3 (≤100 g/dL), can we predict whether the patient has LN with class IV. Here, C3 is linked to systemic lupus erythematosus.