Difference between nephrotic and nephritic syndrome
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nephrotic vs nephritic syndrome comparison table
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Nephrotic vs. Nephritic Syndrome
These two syndromes represent the two major patterns of glomerular disease, distinguished by their pathophysiology, clinical features, and underlying causes.
Core Distinction
| Feature | Nephrotic Syndrome | Nephritic Syndrome |
|---|---|---|
| Primary defect | Increased glomerular permeability to proteins | Glomerular inflammation → capillary wall injury |
| Hallmark | Massive proteinuria (≥3.5 g/day) | Hematuria with dysmorphic RBCs + RBC casts |
| Mechanism | Podocyte/GBM charge or structural defect | Immune-mediated inflammation → endothelial disruption |
Clinical Features
| Feature | Nephrotic | Nephritic |
|---|---|---|
| Proteinuria | Massive (≥3.5 g/day in adults) | Mild to moderate (subnephrotic range) |
| Hematuria | Absent or microscopic | Prominent — dysmorphic RBCs, RBC casts |
| Edema | Marked, soft, pitting — periorbital, dependent | Mild; may have volume overload |
| Hypertension | Present (secondary) | Often prominent (volume overload + renin) |
| Oliguria / AKI | Usually absent | Common — reduced GFR, azotemia |
| Hypoalbuminemia | Yes (plasma albumin <3 g/dL) | Not a defining feature |
| Hyperlipidemia / lipiduria | Yes (compensatory hepatic lipoprotein synthesis) | Absent |
| Urine casts | Fatty casts, oval fat bodies | RBC casts (pathognomonic for GN), granular casts |
| Complement (C3/C4) | Usually normal | Often low (immune complex activation) |
Pathophysiology
Nephrotic
The glomerular capillary wall (endothelium + GBM + podocytes) loses its normal size and charge barrier. Proteins — predominantly albumin, but also globulins — leak into the filtrate. This triggers a cascade:
- Heavy proteinuria → hypoalbuminemia (loss exceeds hepatic synthesis)
- ↓ oncotic pressure → generalized edema (periorbital, ascites, pleural effusions)
- Compensatory hepatic synthesis → hyperlipidemia + lipiduria
- Additional factors: ↑ aldosterone, ↑ sympathetic tone, ↓ ANP → sodium/water retention
Proteinuria selectivity matters: highly selective (mostly albumin/transferrin) = minimal change disease; poorly selective (albumin + large globulins) = more structural damage — Henry's Clinical Diagnosis and Management by Laboratory Methods
Nephritic
Inflammatory cells (neutrophils, monocytes) infiltrate and proliferate within glomeruli, injuring capillary walls. Blood escapes into the urinary space (hematuria). Injury reduces GFR → fluid retention, azotemia, and renin-mediated hypertension. — Robbins, Cotran & Kumar Pathologic Basis of Disease
Causes
Nephrotic — primary (in decreasing prevalence):
- Focal segmental glomerulosclerosis (FSGS)
- Membranous nephropathy (often anti-PLA2R antibodies)
- Minimal change disease (especially children)
- Membranoproliferative GN
Nephrotic — secondary:
- Diabetic nephropathy, amyloidosis, membranous lupus nephritis, HIV nephropathy
Nephritic — causes:
| Category | Examples |
|---|---|
| Post-infectious | Post-streptococcal GN (types 1, 4, 12 strep A), endocarditis |
| ANCA-associated vasculitis | Granulomatosis with polyangiitis, microscopic polyangiitis |
| Anti-GBM disease | Goodpasture syndrome |
| Immune complex | SLE (proliferative lupus nephritis), IgA nephropathy, cryoglobulinemia |
| Rapidly progressive GN | Crescentic GN (any of the above can cause this) |
Post-streptococcal GN — the classic teaching case — occurs 1–4 weeks after pharyngitis or impetigo, most commonly in children aged 6–10. Caused by immune complex deposition (streptococcal pyogenic exotoxin B antigens + antibodies), complement activation (low C3), and neutrophil infiltration. — Robbins
Urinalysis Summary
| Finding | Nephrotic | Nephritic |
|---|---|---|
| Protein | 3+ to 4+ | 1+ to 2+ |
| Blood | Negative / trace | 2+ to 3+ |
| Casts | Fatty casts, oval fat bodies | RBC casts, granular casts |
| RBC morphology | Normal if present | Dysmorphic (acanthocytes) |
Key Memory Hook
NephROtic = PROtein (lots of protein leaks out — frothy urine, puffy eyes, high lipids) NephRItic = InflammatIon + Blood (inflamed glomerulus bleeds — cola/tea-colored urine, oliguria, hypertension)
Overlap
Some diseases can cause mixed nephrotic-nephritic features — notably membranoproliferative GN, diffuse proliferative lupus nephritis (Class IV), and IgA nephropathy. Rapidly progressive (crescentic) GN presents as nephritic syndrome but with accelerated loss of renal function over days to weeks, which is a medical emergency. — Goldman-Cecil Medicine; Harrison's Principles of Internal Medicine 22E
Sources: Robbins, Cotran & Kumar Pathologic Basis of Disease; Goldman-Cecil Medicine; Harrison's Principles of Internal Medicine 22E; Henry's Clinical Diagnosis and Management by Laboratory Methods
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