CD40LG and hepatitis A virus infection: Additional laboratory studies were also obtained including antiglomerular basement membrane (GBM) antibodies, complement C3 and C4 levels, antineutrophil antibodies, antineutrophil cytoplasmic antibodies, antiproteinase 3, anti-Smith, anti-double-stranded DNA, HIV antibody, hepatitis A IgM antibody, hepatitis B surface antigen, hepatitis B core IgM antibody, hepatitis C antibody, and antistreptolysin O. These test were pending at the time of the biopsy and were all subsequently reported as unremarkable except the anti-GBM antibody, which was elevated at 156 arbitrary units.