Urine Total Protein

1️⃣ Proteinuria (Increased Urinary Protein)

Defined as >150 mg/day.

Types of Proteinuria:
A. Glomerular Proteinuria

Due to increased glomerular permeability.

Seen in:

• Glomerulonephritis
• Nephrotic syndrome
• Diabetic nephropathy
• Hypertension

Features:

• Albumin predominates
• May be massive (>3.5 g/day in nephrotic syndrome)

B. Tubular Proteinuria

Due to defective tubular reabsorption.

Seen in:

• Tubulointerstitial nephritis
• Drug-induced nephropathy
• Fanconi syndrome

Features:

• Low molecular weight proteins
• Usually <2 g/day

C. Overflow Proteinuria

Due to excess production of low molecular weight proteins.

Seen in:

• Multiple Myeloma (Bence-Jones proteins)
• Hemolysis (hemoglobinuria)
• Rhabdomyolysis (myoglobinuria)

D. Post-Renal Proteinuria

Due to inflammation beyond kidney.

Seen in:

• Urinary tract infections
• Stones
• Tumors

2️⃣ Nephrotic Syndrome

Characterized by:

• Proteinuria > 3.5 g/day
• Hypoalbuminemia
• Edema
• Hyperlipidemia

Urine protein estimation is essential for diagnosis and monitoring.

3️⃣ Early Detection of Kidney Disease

• Microalbuminuria (30–300 mg/day) is an early marker in
• Diabetes mellitus
• Hypertension

Used to detect early diabetic nephropathy.

4️⃣ Monitoring Renal Disease

Urine protein levels are used to:

• Assess disease severity
• Monitor treatment response
• Predict prognosis