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* Creatinine with Estimated Glomerular Filtration Rate (GFR)

Mnemonic

CR GFR

Includes

Creatinine, Estimated GFR

Guidelines

The estimated GFR is used to assess kidney function and any evidence of chronic kidney disease. Estimated GFR is not reported for patients under 18 years of age.

Specimen Collection Requirements

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube

Handling

Allow serum to clot completely at room temperature (minimum: SST - 30 minutes and red top tubes - 60 minutes). Centrifuge and separate serum or plasma from cells within four hours of collection.

Preferred Volume

1.0 mL Serum/Plasma

Minimum Volume

0.25 mL Serum/Plasma (0.60 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens

Stability

AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 24 hours; Refrigerated (2-8°C): 7 days; Frozen (≤ -20°C): 6 months

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Colorimetry

Reference Values

Reference Values

Creatinine: For age related ranges see Chemistry Age Related Reference Ranges and Critical Values.

 

GFR Reference Range (mL/min/1.73m2)

Description

Stage of Chronic Kidney Disease (CKD)

≥60

Normal

None

Kidney damage with normal GFR

1

Kidney damage with mildly decreased GFR

2

30-59

Moderate CKD

3

15-29

Severe CKD

4

0-14

Kidney Failure

5

Critical Values

Creatinine: For critical age related ranges, see Chemistry Age Related Reference Ranges and Critical Values.

Comments

GFR is calculated using the IDMS-traceable MDRD study equation from serum or plasma creatinine, age, gender and race.

CPT Codes

82565

Last Updated: Wednesday, January 13, 2021 02:21:10 AM


Client Services: 503-413-1234