Anti-glomerular basement membrane antibodies are most characteristically associated with which disease?

• A. Goodpasture's syndrome
• B. Systemic lupus erythematosus
• C. Hashimoto thyroiditis
• D. Rheumatoid arthritis

Answer: (A)

Anti-glomerular basement membrane antibodies cause direct antibody-mediated injury to basement membranes in both the kidneys and the lungs, producing a pulmonary-renal syndrome. This is classic for Goodpasture’s syndrome, where patients develop rapidly progressive glomerulonephritis and alveolar hemorrhage due to antibodies targeting type IV collagen in the glomerular and alveolar basement membranes. Clinically, you’d see signs of kidney injury (hematuria, proteinuria, rising creatinine) alongside potential lung symptoms such as coughing up blood. Other listed diseases involve different immune mechanisms or targets (systemic lupus erythematosus is driven by immune complex deposition; Hashimoto thyroiditis and rheumatoid arthritis involve other autoantibody specificities), so the strongest association with anti-GBM antibodies is Goodpasture’s syndrome.