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Information provided for the test includes types of specimens required, volume and handling instructions. If you are unable to locate the test you need please call our Client Services Department at 1-800-877-7016.


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CREATG      Creatinine
Reported as: CREATININE
Also known as: CREAT, GFR, eGFR
Specimen Requirements
Collect:  One gold gel 3.5 mL (also acceptable: plain red )
(FOR HOSPITALS ONLY: also acceptable one green Lithium Heparin gel, 3.0 mL)

Note: If the patient is to be given N-Acetylcysteine (NAC) venipuncture should be performed prior to NAC administration to avoid falsely decreased results. NAC is typically used to treat acetaminophen overdose.
Transport:   1.0 mL (min: 0.5 mL) serum or plasma refrigerated
Separate serum/plasma from cells ASAP.
Stability:  Ambient: 24 Hours serum or plasma / Refrigerated: 7 Days serum (plasma refrigerated: 3 days) / Frozen: 14 Days serum or plasma
Ordering Instructions
Order Remarks:  Refer to test code CREAFL (Creatinine, Body Fluid) for Creatinine testing on any other sample source besides blood.
Test Performance
Performed:  Daily
Reporting Time:  Final within 24 Hours
CPT Codes
Interpretive Information
The estimated GFR (eGFR) is reported in two categories: African American and non-African American. Reporting is as follows:

eGFR results <91 are reported as a numeric value, mL/min/1.73m²

The interpretive guidelines for numeric values are as follows:

eGFR greater than or equal to 90 = Normal kidney function.

eGFR 60 - 89 = Mild decrease in kidney function.

eGFR 30 - 59 = Moderate decrease in kidney function. Stage 3 CKD (chronic kidney disease) or moderate kidney disease.

eGFR 15 - 29 = Severe decrease in kidney function. Stage 4 CKD (chronic kidney disease) or severe kidney disease.

eGFR <15 = Kidney failure or Stage 5 CKD (chronic kidney disease).

The CKD-EPI (National Kidney Foundation Chronic Kidney Disease - Epidemiology) equation is used for this estimation. The eGFR is invalid if the serum creatinine is changing on a daily basis, as in dialysis patients or patients with acute renal failure. The CKD-EPI equation has not been validated in patients >93 years of age and the clinician must determine suitability of the value for the patient.

If the patient is <18 years of age, a statement is reported that reads, "GFR NOT CALCULATED FOR AGE LESS THAN 18 YEARS."

If the patient sex or age is unknown, a statement is reported that reads, "NOT CALCULATED FOR UNKNOWN SEX OR AGE."

N- Acetylcysteine (NAC) may cause falsely decreased triglyceride results. NAC is typically used in treatment of Acetaminophen overdose.
Creatinine (CREA)Estimated GFR African American (GFRA)
Estimated GFR Non-African American (GFRNA) 
Revision History
08/18/2017Biennial ReviewInterpretive information clarified per DB 11978.
04/25/2017OtherRemoved interpretive information 'Stage 1' from normal kidney function per request, DB 10869
03/22/2017OtherAdded Interpretive Information as part of the March 2017 build cycle, DB 11173.

The information on this page is current as of 12/15/2017.
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