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Test Code LAB4068 CREATININE W/GFR

Specimen Type

Preferred Sample: Lithium Heparin Plasma(Mint Green Top, Dark Green Top)
Alternate Sample: Serum (SST, Gold, Corvac, Tiger, Red Top Tube)

Specimen Volume

2 mL

Minimum Volume

0.2 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Room Temperature: 7 days

Refrigerated: 7 days

Frozen: 3 months

Method

Photometric

Reference Ranges

Creatinine mg/dL

Age Sex Range
0 up to 28 days Female 0.30 - 1.00
28 days up to 1 year Female 0.20 - 0.40
1 year up to 12 years Female 0.30 - 0.70
12 years up to 19 years Female 0.50 - 1.00
19 years and older Female 0.55 - 1.02
0 up to 28 days Male 0.30 - 1.00
28 days up to 1 year Male 0.20 - 0.40
1 year up to 12 years Male 0.30 - 0.70
12 years up to 19 years Male 0.50 - 1.00
19 years and older Male 0.73 - 1.18

Estimated Glomerular Filtration Rate mL/min/1.73m2

National Kidney Foundation (NKF) Guideline for Chronic Kidney Disease (CKD)with GFR Stages: 

G1: ≥90  - NORMAL OR HIGH 
G2: 60-89 - MILDLY DECREASED 
G3a: 45-59 - MILDLY TO MODERATELY DECREASED 
G3b: 30-44 - MODERATELY TO SEVERELY DECREASED 
G4: 15-29 - SEVERELY DECREASED 
G5: <15   - KIDNEY FAILURE 

Abnormalities present for at least 3 months discriminate between chronic and acute disease. 

 

Estimated GFR is calculated using the CKD-EPI equation.

Synonyms

EGFR; GFR; Estimated Glomerular Filtration Rate; Glomerular Filtration Rate, Estimated

CPT Codes

82565

Test Components

Creatinine, mg/dL;

Estimated Glomerular Filtration Rate, mL/min/1.73m2.

Rejection Criteria

Icteric specimens.

Clinical Information

Creatinine is eliminated from blood by glomerular filtration. Reduced renal function results in an increased serum creatinine concentration. Measurement of serum creatinine is used to diagnose and monitor acute and chronic renal disease, estimate glomerular filtration rate (GFR), or assess the status of renal dialysis patients. Current guidelines define chronic kidney disease as kidney damage or glomerular filtration rate (GFR) less than 60 mL/min per 1.73 m2 for three months or more, regardless of cause.