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Test Code CRETWB or LAB2494 Creatinine w/GFR, Whole Blood, STAT

Important Note

This test is intended for STAT requests on patients needing a GFR prior to administration of contrast media for radiologic procedure at BMH &  BBC. 

Note: Estimated glomerular filtration rate (eGFR) is calculated with all creatinine requests on patients over the age of 18 years.  Effective 1/5/22, the CKD-EPI 2021 formula is used. This formula does not utilize race-based coefficients. See the December 2021 edition of LabWire for details. 

Additional Codes

LAB2494

Specimen Requirements

Container Type:

Acceptable: Green or Mint Top - Whole Blood Unspun
Optimal Collection Volume: 

4.5mL; full tube
Minimum Volume:
  • Adults: 1 mL whole blood
  • Neonates: 1 microtainer (400-600 uL)
Collection Instructions:

Gently invert the sample 5-6 times after collection.
Specimen Transport:

Refrigerate
Processing Instructions:  Do not centrifutge sample.  Deliver directly to blood gas section of laboratory

Specimen Stability

Specimen Type Temperature Time
Whole Blood Refrigerated 4 hours

Specimen Rejection Criteria

Clotted or QNS samples. 

Methodology

Radiometer ABL 827 - Enzymatic amperometric

Reference Ranges

Age

Reference Range and Reporting Units
Newborns (1-4 days) 0.30-1.00 mg/dL
Infants (5 days to 11 years) 0.20-0.70 mg/dL
Adolescents (12-16 years) 0.50-1.00 mg/dL
Males ≥ 17 years 0.70-1.30 mg/dL
Females ≥ 17 years 0.60-1.10 mg/dL

Critical Values

  •   < 2 years:   ≥ 2.00 mg/dl
  •  2-11 years:  ≥ 2.50 mg/dl
  • 12-16 years: ≥ 3.00 mg/dl
  •    >16 years: ≥ 7.50  mg/dl 

Estimated GFR:

National Kidney Foundation Guidelines:

  • Chronic kidney disease: eGFR < 60 mL/min
  • Kidney failure: eGFR < 15 mL/min

Day(s) Performed

24/7

Expected TAT

20 minutes from time of arrival into laboratory

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo and Battle Creek,

Sample Retention Time

6 days

CPT Code

82565

LOINC Code

45066-8