Respiratory failure and macrophage activation syndrome as an onset of systemic lupus erythematosus: A case report

Table 2 Autoimmune work-up and biopsy results

Items	Result	Reference values
ANA antibody	1:320(+)	Negative
Anti-Ro-52	++	Negative
Anti-SS-A	+++	Negative
Anticardiolipin IgM	+	Negative
Anti-dsDNA	Negative	Negative
Anti-SM	Negative	Negative
Complement C3 (g/L)	0.439	0.79-1.52
Complement C4 (g/L)	0.18	0.16-0.38
ANCA	Negative	Negative
MPO+PR3	Negative	Negative
IgG4 (g/L)	0.164	0.03-2.01
Soluble CD25 (pg/mL)	8516	< 6400
Crushed red blood cells and Coombs test	Negative	Negative
Natural killer cell function	Not able to complete
Lymph node biopsy	Kikuchi lymphadenitis, CD68/CD163 positive by immunohistochemistry analysis	Negative

ANA: Antinuclear antibody; ANCA: Antinuclear cytoplasmic antibody; MPO: Myeloperoxidase; PR3: Protease 3.