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Topics:
Rheumatology
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Systemic lupus erythematosus
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Complement system
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Urticaria/Angioedema
How do you interpret high C1q binding assay with otherwise normal C1q, C3, C4, CH50 in a patient with recurrent urticaria with positive ANA at high titer 1:1280, negative dsDNA, RNP, SM, normal CBC, CMP, UA, and UPCR.
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