Goodpasture syndrome is one of those “if you see it, you have to call it” USMLE diagnoses: a pulmonary–renal syndrome with hemoptysis + hematuria that lives at the intersection of interstitial lung disease and rapidly progressive glomerulonephritis. Here’s a 5‑second rule you can blurt out on test day and move on.
The 5‑Second Rule (say this in your head)
“Goodpasture = anti–GBM (type IV collagen) → hemoptysis + RPGN; linear IF; treat with plasmapheresis + steroids.”
If you can recall that single line, you can usually answer the question.
One-Liner Explanation (shareable)
Autoantibodies against the glomerular and alveolar basement membranes (type IV collagen) cause pulmonary hemorrhage and rapidly progressive glomerulonephritis with linear IgG on immunofluorescence.
The Visual/Mnemonic Device
“GOOD PASTURE” = Good lungs + pasture (kidneys) get attacked
Picture a cow in a pasture coughing up blood:
- COW COUGHING BLOOD → hemoptysis (pulmonary hemorrhage)
- PASTURE = kidney field → hematuria (GN)
- A straight fence line across both → LINEAR IgG deposition on IF
(the “fence” is the basement membrane)
Micro-mnemonic: GOOD = GBM Only Outlined Directly
- GBM outlined directly = linear staining on direct immunofluorescence
Why it’s “Pulmonary” (and why it can look restrictive)
Goodpasture classically causes diffuse alveolar hemorrhage, which can present with:
- Dyspnea
- Hemoptysis (may be absent early—don’t require it)
- Anemia (blood loss into alveoli)
- Diffuse alveolar infiltrates on CXR/CT
In question stems, this can be framed alongside interstitial/restrictive patterns (hypoxemia, diffuse infiltrates, reduced DLCO), but the key is:
This is not fibrosing ILD—it’s bleeding into alveoli from anti-GBM injury.
High-Yield USMLE Facts (the stuff they test)
Pathogenesis
- Type II hypersensitivity (antibody-mediated)
- Target: chain of type IV collagen in:
- Glomerular basement membrane
- Alveolar basement membrane
Classic Clinical Picture
- Pulmonary hemorrhage: hemoptysis, dyspnea, hypoxemia
- Renal disease: rapidly progressive glomerulonephritis (RPGN)
- Hematuria, RBC casts, proteinuria, rising creatinine
Key Diagnostics
- Anti-GBM antibodies in serum
- Renal biopsy:
- Light microscopy: crescentic GN (RPGN pattern)
- Immunofluorescence: linear IgG (± C3) along GBM
Treatment (Step 2 style)
- Plasmapheresis (removes circulating antibodies)
- High-dose corticosteroids + immunosuppression (e.g., cyclophosphamide)
Associations/Clues
- Can be triggered/worsened by smoking or hydrocarbon exposure (alveolar basement membrane injury exposes antigen)
- Often presents in young men or older adults (bimodal)
Goodpasture vs “Look-Alikes” (fast differential table)
| Syndrome | Key organs | Antibody/Mechanism | Immunofluorescence | Buzzwords |
|---|---|---|---|---|
| Goodpasture | Lung + kidney | Anti-GBM (type IV collagen) | Linear IgG | Hemoptysis + RPGN |
| Granulomatosis with polyangiitis (GPA) | Upper airway + lung + kidney | c-ANCA (PR3) | Pauci-immune | Sinusitis, cavitary nodules |
| Microscopic polyangiitis (MPA) | Lung + kidney | p-ANCA (MPO) | Pauci-immune | No granulomas, pulmonary capillaritis |
| IgA vasculitis (HSP) | Skin + GI + kidney | IgA immune complexes | Granular IgA | Palpable purpura, abdominal pain |
Test-day shortcut:
- Linear = Goodpasture
- Granular = immune complex (e.g., IgA, lupus)
- Pauci-immune = ANCA vasculitis
5-Second Recall Card (write this on your mental whiteboard)
- Anti-GBM (type IV collagen)
- Lung + kidney
- Hemoptysis + hematuria/RPGN
- Linear IgG on IF
- Tx: plasmapheresis + steroids (± cyclophosphamide)