LAUSR

Most cases of hepatitis B virus–associated glomerulonephritis (HBV‐GN) occur in children and present with serum HBsAg positivity. Few studies have investigated adult patients with HBV‐GN who are serum HBsAg‐negative. This study aimed to determine the clinical and pathological features of adult patients with HBV‐GN who are serum hepatitis B surface antigen (HBsAg)‐negative. Clinical, pathologic, and laboratory findings were collected and analyzed in a cohort of 27 adult patients with HBV‐GN who were serum HBsAg‐negative upon diagnosis. The study population included mostly men of middle age (40‐59 years). Clinically, patients presented with nephrotic syndrome. Serum immunoglobulin G levels were low, whereas serum immunoglobulin M, immunoglobulin A, complement C3 (C3), and complement C4 (C4) levels as well as liver and renal function tests were normal in most or all patients. Among the 27 patients, 21 tested positive for HBV antibodies. Membranous nephropathy was the dominant pathological form on kidney biopsy. In addition, only a few patients showed a “full house” staining pattern and renal immune deposit of complement C1q (C1q). Serum HBsAg‐negative HBV‐GN may represent a late stage of HBV infection. We recommend routine testing for HBV markers on renal biopsy in regions where HBV is prevalent, even when tests for serum HBV markers are negative.