SLE History Taking OSCE — ACR Criteria, Malar Rash, Renal and Neurological Features

Why SLE History Is Tested

SLE is a multisystem autoimmune disease that affects young women predominantly (9:1 female:male ratio, peak onset 20–40 years). It appears in OSCE history stations because it requires systematic enquiry across multiple organ systems, knowledge of diagnostic criteria, and awareness of drug therapies and monitoring.

ACR/SLICC Criteria Mnemonic — SOAP BRAIN MD

4 or more criteria (serially or simultaneously) = SLE diagnosis (ACR 1997 criteria).

Opening and Core History

Opening: "Can you tell me about your symptoms — when did you first notice something wasn't right?"

Key domains to explore:

Skin

• Malar (butterfly) rash: erythema over cheeks and bridge of nose, sparing nasolabial folds; worsens with sun exposure; does NOT cross nasolabial folds (distinguishes from rosacea)
• Discoid rash: raised, scaly, scarring lesions — most common on face, scalp, ears
• Photosensitivity: skin rash or flare with sun exposure
• Alopecia (hair loss): diffuse, non-scarring; a classic feature
• Oral/nasal ulcers: usually painless (in contrast to aphthous ulcers)
• Raynaud's phenomenon: common, suggests also query overlap with systemic sclerosis

Joints

• Arthritis: symmetrical, non-erosive (does not damage cartilage/bone — unlike RA), affecting wrists, MCPs, PIPs, knees
• Morning stiffness duration
• Jaccoud's arthropathy: reducible deformity without erosion (unique to SLE)

Renal

• Haematuria, proteinuria, frothy urine (nephritis/nephrotic syndrome)
• Oedema (nephrotic)
• Hypertension (renal involvement)

Neuropsychiatric

• Seizures, headaches, cognitive impairment ("lupus fog")
• Depression, psychosis (can be disease or steroid-related)
• Peripheral neuropathy

Serositis

• Pleuritis: pleuritic chest pain (sharp, worse on inspiration)
• Pericarditis: central chest pain, worse lying flat, relieved sitting forward
• Peritonitis (rare)

Haematological

• Easy bruising, prolonged bleeding (thrombocytopenia)
• Recurrent infections (leukopenia)
• Haemolytic anaemia symptoms (jaundice, fatigue)
• Antiphospholipid syndrome: recurrent miscarriages, DVT/PE, livedo reticularis

Medications and Monitoring

Investigations to Mention

ANA (sensitive but not specific), anti-dsDNA (specific, correlates with disease activity), anti-Sm (very specific), antiphospholipid antibodies (anticardiolipin, lupus anticoagulant), complement (C3, C4 — low in active disease), FBC, renal function, urinalysis, 24-hour urine protein.

Frequently Asked Questions

"What is the SOAP BRAIN MD mnemonic and how do you use it in an SLE OSCE?"

SOAP BRAIN MD is a mnemonic for the 11 ACR classification criteria for SLE: Serositis, Oral ulcers, Arthritis, Photosensitivity, Blood disorders, Renal disorder, ANA positive, Immunological markers (anti-dsDNA, anti-Sm, antiphospholipid), Neurological features, Malar rash, and Discoid rash. A patient meeting 4 or more of these criteria (simultaneously or cumulatively) meets the ACR 1997 classification for SLE. In an OSCE, using this framework to structure your history enquiry ensures you cover all major organ systems systematically — ask about each domain in turn, not just the presenting complaint.

"What is the difference between a malar rash and rosacea?"

Both cause facial erythema across the cheeks, but they differ in several key ways. The malar rash of SLE spares the nasolabial folds — it appears as a butterfly-shaped erythema across both cheeks and the bridge of the nose, without involving the skin creases beside the nose. It is flat or slightly raised, non-scarring, and worsens with sun exposure. Rosacea causes erythema that typically involves the nasolabial folds and nose, with telangiectasia, papules, and pustules, and is not specifically triggered by sunlight. Discoid lupus causes raised, scaly, scarring lesions. The distinction matters clinically because malar rash in a young woman with arthritis, fatigue, and ANA positivity strongly suggests SLE.

"Why is renal involvement so important to ask about in SLE history taking?"

Lupus nephritis occurs in 30–50% of SLE patients and is one of the leading causes of significant morbidity and mortality in SLE. It can present insidiously — patients may be unaware of haematuria or proteinuria unless specifically tested. Renal involvement is classified into classes I–VI by WHO/ISN (class III and IV — focal and diffuse proliferative — are the most severe and require aggressive immunosuppression with mycophenolate and prednisolone). In an OSCE, always ask about: frothy urine (proteinuria), haematuria (visible or tested on dipstick), ankle oedema (nephrotic syndrome), hypertension, and reduced urine output. State that urinalysis (haematuria, proteinuria, casts) and renal function should be checked at every review.

"What is antiphospholipid syndrome and how does it relate to SLE?"

Antiphospholipid syndrome (APS) is characterised by recurrent arterial and venous thrombosis, pregnancy morbidity (recurrent miscarriages, premature birth, pre-eclampsia), and persistently positive antiphospholipid antibodies (anticardiolipin antibodies, lupus anticoagulant, anti-β2-glycoprotein I). APS occurs in approximately 30–40% of SLE patients (secondary APS) and can also occur independently (primary APS). In an OSCE history, ask about: previous DVT or PE, strokes or TIAs, livedo reticularis (mottled skin), recurrent miscarriages, and previous positive blood tests. Management of thrombotic APS involves long-term anticoagulation, typically with warfarin (target INR 2–3 or higher for arterial events).

"What monitoring is required for patients on hydroxychloroquine?"

Hydroxychloroquine (HCQ) is a cornerstone treatment for SLE — it reduces disease flares, organ damage, and mortality. The most important side effect is retinal toxicity (hydroxychloroquine maculopathy), which causes irreversible loss of vision — particularly central vision — and may progress even after stopping the drug. Monitoring: baseline ophthalmology assessment including visual acuity, colour vision, and visual fields, followed by annual retinal screening (spectral domain OCT and Humphrey visual fields) after 5 years of use (earlier if risk factors: dose >5 mg/kg/day, renal impairment, pre-existing maculopathy). Also note: HCQ can prolong the QTc interval and rarely causes neuromyopathy. It is generally safe in pregnancy.

"What is Jaccoud's arthropathy and how does it differ from rheumatoid arthritis?"

Jaccoud's arthropathy is a reducible deformity of the hands occurring in SLE — it may closely mimic rheumatoid arthritis in appearance, with ulnar deviation of the fingers and swan-neck or boutonnière deformities. The key distinguishing feature is that Jaccoud's arthropathy is non-erosive: the joint cartilage and bone are not destroyed, so X-rays show no erosions (unlike RA where erosions are a hallmark). The deformities in Jaccoud's are caused by ligamentous laxity and tendon imbalance rather than joint destruction — they can be passively corrected (reducible). On examination, you can straighten the deformed fingers yourself, which is not possible in established RA with fixed deformities.

Related guides: Rheumatoid Arthritis History OSCE · Musculoskeletal History OSCE · GALS Screening Examination OSCE · Dermatology History OSCE · Blood Results Interpretation OSCE