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St. John Health System
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Creatinine

Order Name CREATININE
Test Number: 2025050
Revision Date 09/17/2025
Test Name Methodology LOINC Code
Creatinine
Kinetic Alkaline Picrate (Jaffe) 2160-0 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Alternate 1 1 mL (0.5) Serum Clot Activator SST Refrigerated
Instructions Specimen Stability: Ambient 7 days, Refrigerated 7 days, Frozen 3 months
GENERAL INFORMATION
Testing Schedule Daily 
Expected TAT 1-2 days 
Clinical Use Useful for sensitive and quantitative measurement of renal function. A Glomerular Filtration Rate (GFR) is also provided.
Reference range for GFR African American and non-African American
Normal GFR: <60 mL/Min.
Moderately decreased GFR: 30-59 mL/Min.
Severely decreased GFR: 15-29 mL/Min.
Kidney failure (or Dialysis): < 15 mL/Min.
 
Notes Serum creatinine values will be used to calculate GFR (Glomerular Filtration Rate) with the 2021 CKD-EPI creatinine GFR calculation.
The following test will be added on and reported at no additional charge.
Order code: GFR Calculation [6907615]
Result code: GFR CALC [6907615]
CPT Code(s) 82565
Internal Comments 2001900
Service Provided By Labcorp Oklahoma, Inc.
Lab Section Chemistry