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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.

Test Components

Creatinine, mg/dL;

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

Synonyms

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

CPT Codes

82565

Rejection Criteria

Icteric specimens.