Ordering Recommendation




Quantitative Enzymatic




Within 24 hours

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Plasma separator tube or serum separator tube. Also acceptable: Lavender (EDTA).

Specimen Preparation

Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.2 mL)

Storage/Transport Temperature


Unacceptable Conditions

Specimens obtained through catheters used to infuse hyperalimentation fluid. Specimens collected with potassium oxalate/sodium fluoride or sodium citrate.


Patient age and sex are required for calculation.


After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 3 months

Reference Interval

Effective August 20, 2018
Calculated GFR - >= 60 mL/min / 1.73 square meters

0-30 days 0.50-1.20 mg/dL 0.50-0.90 mg/dL
31-364 days 0.40-0.70 mg/dL 0.40-0.60 mg/dL
1-3 years 0.40-0.70 mg/dL 0.40-0.70 mg/dL
4-6 years 0.50-0.80 mg/dL 0.50-0.80 mg/dL
7-9 years 0.30-0.60 mg/dL 0.30-0.70 mg/dL
10-11 years 0.30-0.70 mg/dL 0.40-0.80 mg/dL
12-13 years 0.40-0.80 mg/dL 0.40-0.80 mg/dL
14-15 years 0.40-1.10 mg/dL 0.30-0.90 mg/dL
16-18 years 0.60-1.20 mg/dL 0.50-1.00 mg/dL
19 years and older 0.40-1.20 mg/dL 0.40-1.20 mg/dL

Interpretive Data

The CKD-EPI equation for non-African American individuals is used to calculate the estimated glomerular filtration rate (GFR). To estimate the GFR for African Americans, multiply the provided GFR result by 1.16.

The CKD-EPI equation is validated in individuals 18 years of age and older. It is less accurate in patients with extremes of muscle mass, restriction of dietary protein, ingestion of creatine, extra-renal metabolism of creatinine, or treatment with medications that affect renal tubular creatinine secretion.

GFR Categories in Chronic Kidney Disease (CKD)
GFR Category
GFR (mL/min/1.73 square meters)
G1 90 or greater Normal or high*
G2 60-89 Mild decrease*
G3a 45-59 Mild to moderate decrease
G3b 30-44 Moderate to severe decrease
G4 15-29 Severe decrease
G5 14 or less Kidney failure
*In the absence of evidence of kidney damage, neither GFR category G1 nor G2 fulfill the criteria for CKD (Kidney Int Suppl 2013;3:1-150)

Compliance Category



Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0020025 Creatinine, Serum or Plasma 2160-0
0026634 Calculated GFR 62238-1
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • Calculated Glomerular Filtration Rate
  • cGFR
  • eGFR
  • Estimated Glomerular Filtration Rate
Glomerular Filtration Rate, Estimated