Systemic Lupus Erythematosus Diagnosis and Treatment

Diagnostic Workup

The European League Against Rheumatism recommends that the initial workup for suspected SLE should include comprehensive laboratory testing with ANA, anti-dsDNA, complement levels, CBC, renal function, urinalysis, and specific organ system assessments, followed by treatment with antimalarials as first-line therapy for most patients without major organ involvement 1, 2
ANA testing is the essential first step - a negative ANA strongly argues against SLE, while a positive result warrants further evaluation 3
If ANA is positive, proceed with additional immunological tests, including anti-dsDNA and anti-Sm antibodies, complement levels, anti-Ro/SSA, anti-La/SSB, antiphospholipid antibodies, and anti-RNP 1, 2
Complete blood count and renal function tests, including serum creatinine and eGFR, should be performed to assess for cytopenias and renal involvement 1, 4
Urinalysis and urine protein/creatinine ratio should be used to screen for lupus nephritis 1, 4
Inflammatory markers, such as ESR and CRP, should be measured to assess disease activity 4

The American College of Rheumatology recommends hydroxychloroquine as the cornerstone of treatment for most SLE patients, reducing disease flares and improving long-term outcomes 1, 2
All SLE patients should receive hydroxychloroquine unless contraindicated 1, 2
For mild disease without major organ involvement, NSAIDs may be used judiciously for short periods, and low-dose glucocorticoids may be used for symptom control 1, 2
For moderate-severe disease or specific organ involvement, higher-dose glucocorticoids and immunosuppressive agents, such as mycophenolate mofetil and methotrexate, may be considered 1, 2, 6

Disease activity assessment using validated indices should be performed at each visit, and organ damage assessment should be done annually 4
Laboratory monitoring, including CBC, renal function, urinalysis, and immunological tests, should be performed every 3-6 months 4, 5
Cardiovascular risk factors should be assessed annually 4

Photoprotection, calcium and vitamin D supplementation, and low-dose aspirin may be recommended for patients with specific manifestations or risk factors 1, 2, 4
Lifestyle modifications, such as smoking cessation, weight control, and regular exercise, should be encouraged 1, 4