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Laboratory values for patients with kidney disease

Normal range Renal failure
Glomerular filtration rate (GFR) 100-150 mL/min/1.73 m2 <15 mL/min/1.73 m2
Creatinine clearance (female) 85-125 mL/min 10-50 mL/min (moderate)
Creatinine clearance (male) 97-140 mL/min <10 mL/min (severe)
Serum creatinine 0.6-1.2 mg/dL >5.0 mg/dL
Blood urea nitrogen (BUN) 8-18 mg/dL >50 mg/dL
Serum calcium 8.5-10.5 mg/dL Depressed
Serum phosphate 2.5-4.5 mg/dL Elevated
Serum potassium 3.8-5.0 mEq/L Elevated

Stages of chronic kidney disease

Kidney function GFR Comments
Stage 1 slightly diminished ≥90 mL/min/1.73 m2
Stage 2 mild reduction 60–89 mL/min/1.73 m2
Stage 3 moderate reduction 30–59 mL/min/1.73 m2 British guidelines distinguish between stage 3A (GFR 45–59) and stage 3B (GFR 30–44) for purposes of screening and referral
Stage 4 severe reduction 15–29 mL/min/1.73 m2 preparation for renal replacement therapy
Stage 5 established kidney failure <15 mL/min/1.73 m2 permanent renal replacement therapy