C4A and pericardial effusion: Subsequent tests showed positive antinuclear antibodies (ANA) with a nucleolar pattern at a titer of 1:1000, SSA 3+, SSB 3+, Ro-52 3+ and notably low complement levels (C3 0.33 g/L; C4 0.02 g/L), negative anti-dsDNA, albumin at 23.3 g/L, 24-hour urine protein quantification at 0.173 g, urine microalbumin at 163.00 mg/L, an echocardiogram indicating a small to moderate amount of pericardial effusion, normal renal function, and normal blood ions.