Understanding CKD Staging for Pakistani Clinicians

Introduction

Chronic Kidney Disease (CKD) is a growing health concern in Pakistan, with an estimated prevalence of 12-15% in the adult population. Early detection and appropriate staging are crucial for preventing progression to end-stage renal disease (ESRD).

CKD Classification

CKD is classified based on:

1. **Cause** (diabetes, hypertension, glomerulonephritis, etc.)

2. **eGFR category** (G1-G5)

3. **Albuminuria category** (A1-A3)

eGFR Categories

Albuminuria Categories

Screening Recommendations

Who should be screened for CKD in Pakistan?

Patients with diabetes mellitus (type 1 and type 2)

Hypertensive patients

Cardiovascular disease patients

Family history of kidney disease

Age >60 years

Patients with recurrent UTIs, nephrolithiasis

Patients taking nephrotoxic medications (NSAIDs, some antibiotics)

Screening tests:

Serum creatinine (with eGFR calculation)

Urine albumin-to-creatinine ratio (ACR)

Urinalysis

Management by Stage

Stage G1-G2 (Early CKD)

Identify and treat cause

BP target: <130/80 mmHg (ACE inhibitors or ARBs as first-line)

Glycemic control: HbA1c <7% (or <7.5% in elderly)

Lifestyle modifications: low-salt diet, exercise, smoking cessation

Avoid nephrotoxic medications

Annual monitoring

Stage G3a-G3b (Moderate CKD)

All G1-G2 measures plus:

Monitor for complications: anaemia, metabolic acidosis, mineral bone disease

Hb target: 10-11.5 g/dL; consider iron supplementation and ESA if needed

Vitamin D: monitor 25-OH vitamin D and supplement if deficient

Phosphate binders: start if phosphate levels elevated

Referral to nephrologist if eGFR <30 or rapidly declining

6-monthly monitoring

Stage G4 (Severe CKD)

All above measures plus:

Prepare for renal replacement therapy (RRT)

Dietary counselling (protein restriction: 0.6-0.8 g/kg/day)

Manage uraemic symptoms

Vaccinations: Hepatitis B, influenza, pneumococcal

3-monthly monitoring

Stage G5 (Kidney Failure)

RRT options: haemodialysis, peritoneal dialysis, renal transplantation

Conservative care if appropriate

Multidisciplinary team involvement

Common CKD Complications

1. **Anaemia**: start ESA when Hb <10 g/dL (target 10-11.5 g/dL)

2. **Metabolic acidosis**: serum bicarbonate target >22 mEq/L; consider oral bicarbonate

3. **Mineral bone disease**: monitor Ca, PO4, PTH; use vitamin D analogues and phosphate binders

4. **Hyperkalemia**: dietary restriction, avoid K-sparing diuretics, consider potassium binders

5. **Fluid overload**: restrict sodium (2-3 g/day), loop diuretics

Medications to Avoid or Adjust in CKD

When to Refer to a Nephrologist

eGFR <30 mL/min/1.73m²

Rapid decline in eGFR (>5 mL/min/year)

Significant albuminuria (ACR >30 mg/mmol)

Uncontrolled hypertension despite 3+ agents

Suspected glomerulonephritis (haematuria, active urine sediment)

Complications of CKD (anaemia, metabolic acidosis, hyperkalemia)

Family history of hereditary kidney disease

**Disclaimer**: This article is for educational purposes only. Clinical decisions should be made based on individual patient circumstances and specialist consultation.