Table 2:

Additional test results that were available after the diagnosis was made and treatment was started

InvestigationReference rangeResult
Double-stranded DNA antibody, IU/mL< 3037
Double-stranded DNA antibody using Crithidia luciliae as substrateNegativePositive
C3, g/L0.68–2.601.11
C4, g/L0.12–0.460.08
Cryoglobulin quantitative, mg/mL0–5064
Cytomegalovirus DNA by polymerase chain reaction (blood)NegativeNegative
Blood culturesNegativeNo growth
Hepatitis B and C serologyNegativeNegative
Skin biopsy_Consistent with leukocytoclastic vasculitis