Overview of heavy proteinuria and the nephrotic syndrome
- Ellie Kelepouris, MD, FAHA
Ellie Kelepouris, MD, FAHA
- Professor of Medicine
- Chief, Division of Nephrology and Hypertension
- Drexel University College of Medicine
- Brad H Rovin, MD
Brad H Rovin, MD
- Section Editor — Glomerular Diseases
- Professor of Medicine and Pathology
- The Ohio State University College of Medicine
INTRODUCTION AND TERMINOLOGY
Diseases of the glomerulus can result in three different urinary and clinical patterns: focal nephritic; diffuse nephritic; and nephrotic. (See "Glomerular disease: Evaluation and differential diagnosis in adults".)
●Mild nephritic – Disorders resulting in a mild nephritic sediment are generally associated with inflammatory lesions in less than one-half of glomeruli on light microscopy (focal glomerulonephritis). The urinalysis reveals red cells (which often have a dysmorphic appearance), occasionally red cell casts, and mild proteinuria (usually less than 1.5 g/day). The findings of more advanced disease are usually absent, such as heavy proteinuria, edema, hypertension, and renal insufficiency. These patients often present with asymptomatic hematuria and proteinuria discovered on routine examination or, occasionally, with episodes of gross hematuria.
●Severe nephritic – The urinalysis in diffuse glomerulonephritis is similar to focal disease, but heavy proteinuria (which may be in the nephrotic range), edema, hypertension, and/or renal insufficiency may be observed. Diffuse glomerulonephritis affects most or all of the glomeruli.
●Nephrotic – The nephrotic sediment is associated with heavy proteinuria and lipiduria, but few cells or casts. The term "nephrotic syndrome" refers to a distinct constellation of clinical and laboratory features of renal disease. It is specifically defined by the presence of heavy proteinuria (protein excretion greater than 3.5 g/24 hours), hypoalbuminemia (less than 3 g/dL), and peripheral edema. Hyperlipidemia and thrombotic disease are also frequently observed.
Isolated heavy proteinuria without edema or other features of the nephrotic syndrome is suggestive of a glomerulopathy (with the same etiologies as the nephrotic syndrome), but is not necessarily associated with the multiple clinical and management problems characteristic of the nephrotic syndrome. This is an important clinical distinction because heavy proteinuria in patients without edema or hypoalbuminemia is more likely to be due to secondary focal segmental glomerulosclerosis (FSGS) (due, for example, to diabetes) .To continue reading this article, you must log in with your personal, hospital, or group practice subscription. For more information on subscription options, click below on the option that best describes you:
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- INTRODUCTION AND TERMINOLOGY
- Minimal change disease
- Focal segmental glomerulosclerosis
- - Diagnostic issues
- Membranous nephropathy
- Hyperlipidemia and lipiduria
- Protein malnutrition
- Acute kidney injury
- Serologic studies
- Renal biopsy
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- INFORMATION FOR PATIENTS