Case Report
Can Cell Bound Complement Activation Products Predict Inherited Complement Deficiency in Systemic Lupus Erythematosus?
| ANA | Result | Reference ranges |
| Immunofluorescence (IIF) | 1 : 1280 (positive)/homogeneous | Negative (<1 : 80); positive (≥1 : 80) |
| Analyte | Result | Reference ranges |
| Anti-dsDNA (ELISA) | 867 IU/mL (positive, confirmed by Crithidia) | ≤301 (negative); > 301 (positive) | Anti-Smith (ELISA) | 46 U/mL (positive) | <5 (negative); 5–10 (equivocal); > 10 (positive) | EC4d (FACS) | 6 Net MFI (negative) | ≤12 (negative); > 12–75 (positive); > 75 (strong positive) | BC4d (FACS) | 43 Net MFI (negative) | ≤48 (negative); > 48–200 (positive); > 200 (strong positive) | Anti-U1RNP IgG | 14 U/ml (positive) | <5 (negative); 5–10 (equivocal); > 10 (positive) | Anti-RNP70 IgG | 2 U/ml (negative) | <7 (negative); 7–10 (equivocal); > 10 (positive) | Anti-SS-A/Ro IgG | >240 U/ml (positive) | <7 (negative); 7–10 (equivocal); > 10 (positive) | Anti-SS-B/La lgg | >320 U/ml (positive) | <7 (negative); 7–10 (equivocal); > 10 (positive) | C3 | 69 mg/dl | 90–180 mg/dl | C4 | 3 mg/dl | 16–47 mg/dl |
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ELISA: enzyme-linked immunosorbent assay. FACS: fluorescence-activated cell sorting.
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