1-Patients who fulfill the 2019 American College of Rheumatology/European League against Rheumatism classification criteria of Systemic Lupus Erythematosus 2-Patients diagnosed as lupus nephritis , actually did renal biobsy 3-Patients who is able to give informed consent to join the study
You may not be if
\- Any patient with any collagen disease other than systemic lupus erythematosus.