Study to Assess Demographic, Pharmacologic, Biomarker, Clinical Features and Quality of Life (QoL) of Participants With Lupus Nephritis

Inclusion Criteria: * More than or equal to 18 years of age * Clinician diagnosed LN participants. * At least one visit to the investigational center during 12 months prior to the baseline visit, recorded in medical documentation. * Literacy in English or Arabic allowing to fully comprehend the written informed consent and study-specific patient reported questionnaires. Exclusion Criteria: * Incomplete medical records to be able to assess the disease severity or absence of any of the following renal laboratory results from the medical record within the last twelve months: a. Urinary protein to creatinine ratio (UPCR) or 24-hour proteinuria or urine sediment (activity). b. Serum creatinine or estimated glomerular filtration rate (eGFR); or measured glomerular filtration rate (GFR), if eGFR is not available. * Current or medical history of: a. Congenital or acquired immunodeficiency. b. Malignancy in active treatment phase. c. Acute viral infection, such as human immunodeficiency virus (HIV) infection, requiring hospitalization.