Table 1.

Laboratory results.

	Normal value	Patient’s value
Rheumatoid factor	0–14 U/mL	6.3
Beta2-microglobulin	0.8–2.4 mg/L	2.3
Interleukin 6	0–7 pg/mL	1.5
ANA	Pos 1:160	Negative
IgA EMA	Negative	Negative
ANCA	Negative <1:20	Negative
Anti- MPO	Negative <3.5	0.1
Anti-PR3	Negative <2	0.1

ANA, anti-nuclear antibodies; IgA EMA, IgA anti-endomysial antibodies; ANCA, anti-neutrophil cytoplasmic antibodies; Anti-MPO, anti-myeloperoxidase antibodies; Anti-PR3, anti-proteinase-3 antibodies.