Chronic Kidney Disease Classification and Management

CKD Stage 3 Subdivisions

• A GFR of 47 mL/min/1.73 m² is classified as Stage 3b chronic kidney disease, according to the American Journal of Kidney Diseases guidelines 1
• The current classification system divides Stage 3 CKD into two subcategories based on GFR thresholds, with Stage 3a defined as GFR 45-59 mL/min/1.73 m² and Stage 3b defined as GFR 30-44 mL/min/1.73 m² 1
• Stage 3a CKD is defined as GFR 45-59 mL/min/1.73 m², as per the American Journal of Kidney Diseases guidelines 2

Diagnostic Approach

• Confirm the diagnosis with repeat eGFR measurement, as single values may be affected by acute factors, as recommended by the Annals of Oncology 3
• Assess for albuminuria or proteinuria, which is essential for accurate risk stratification and determines whether the reduced GFR represents true kidney disease versus age-related decline, according to the European Heart Journal 4

Management

• Monitor blood pressure control with target ≤140/90 mmHg, as recommended by the American Heart Association, although the provided citation is from Praxis Medical Insights: Practical Summaries of Clinical Guidelines 5