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Laboratory Values for Patients with Kidney Disease

Normal rangeRenal failure
Glomerular filtration rate (GFR)100-150 mL/min/1.73 m2<15 mL/min/1.73 m2
Creatinine clearance (female)85-125 mL/min10-50 mL/min (moderate)
Creatinine clearance (male)97-140 mL/min<10 mL/min (severe)
Serum creatinine0.6-1.2 mg/dL>5.0 mg/dL
Blood urea nitrogen (BUN)8-18 mg/dL>50 mg/dL
Serum calcium8.5-10.5 mg/dLDepressed
Serum phosphate2.5-4.5 mg/dLElevated
Serum potassium3.8-5.0 mEq/LElevated

Stages of chronic kidney disease#

Kidney functionGFRComments
Stage 1slightly diminished≥90 mL/min/1.73 m2
Stage 2mild reduction60–89 mL/min/1.73 m2
Stage 3moderate reduction30–59 mL/min/1.73 m2British guidelines distinguish between stage 3A (GFR 45–59) and stage 3B (GFR 30–44) for purposes of screening and referral
Stage 4severe reduction15–29 mL/min/1.73 m2preparation for renal replacement therapy
Stage 5established kidney failure<15 mL/min/1.73 m2permanent renal replacement therapy

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