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General Medicine · Rheumatology
Sample itemA 24-year-old woman has a malar rash, symmetrical arthralgia and new proteinuria. Which autoantibody best correlates with lupus nephritis and disease activity?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. Anti-double-stranded DNA antibody
The picture is systemic lupus erythematosus with renal involvement. Anti-dsDNA antibodies are specific for lupus, rise with disease activity and are associated with nephritis, so titres are followed along with complement levels.
Option by option
A. Anti-centromere antibody
Anti-centromere antibodies are linked to limited cutaneous systemic sclerosis.
B. Anti-Jo-1 antibody
Anti-Jo-1 antibodies are seen in polymyositis with interstitial lung disease and the antisynthetase syndrome.
C. Anti-double-stranded DNA antibody (correct)
Correct. Rising anti-dsDNA titres with low complement track lupus activity and nephritis.
D. Anti-histone antibody
Anti-histone antibodies characterise drug-induced lupus, which spares the kidney.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.