SLE renal activity — SCE Rheumatology MCQ
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Correct answer: D — Urine protein:creatinine ratio and microscopy
Quantifying proteinuria and checking active urinary sediment are immediate tests for suspected lupus nephritis. The distractors investigate different diseases and would not answer the immediate diagnostic question. The most useful rheumatology investigation is the one that changes diagnosis, urgency or treatment choice.
Reference: BSR hot swollen joint guideline; NICE CKS; EULAR imaging recommendations