Test Overview
Test Methodology

See individual tests.

Test Usage

See individual tests.

Reference Range *

See individual tests.
2021 CKD-EPI ≥ 60 mL/min/1.73m^2
The 2021 CKD-EPI equation should not be used to predict EGFR in unstable patients or in children. A GFR estimate between 15 and 59 for ≥ 3 months is classified as Chronic Kidney Disease (Stage 3 or 4).
GFR estimate can be interpreted accurately only during a steady state of creatinine balance. GFR estimate will overestimate true GFR if serum creatinine is rising (such as acute kidney failure) and will underestimate true GFR if serum creatinine is declining (such as resolution of acute kidney failure).
EGFR is not calculated when serum creatinine values are <0.1mg/dL [11/20]

Test Limitations

2021 CKD-EPI calculations are not valid for patients less than 18 years of age and for pregnant women.
The 2021 CKD-EPI formula used to calculate the EGFR result has not been validated in patients > 100
years of age.
The EGFR should NOT be used for pharmacy drug dosing.
The calculation is not useful for estimating GFR in unstable patients or
patients with acute renal failure. There are other conditions where the EGFR will be less
accurate and should not be utilized. These include: extremes of body size and weight, skeletal
muscle disease, paraplegia or quadriplegia, vegetarian diet, and for the calculation of dose of
potentially toxic drugs that are excreted by the kidney. [11/20]

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

2 hours

Soft Order Code
MiChart Code
Basic Metabolic Panel
  • Chemistry Profile, Basic Metabolic Panel
  • CO2
  • Metabolic Panel, Basic
  • Profile, Basic Metabolic
  • BMP
  • Basic Metabolic Panel
  • CAL
  • GLUC
  • POT
  • SOD
  • UN
Chemical Pathology
STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements
Collection Instructions

Collect specimen in an SST tube. Centrifuge within 4 hours of collection, aliquot serum into a plastic vial and refrigerate. If specimen cannot be centrifuged at client site, please arrange for delivery to MLabs within 3 hours of specimen collection.

Alternate Specimen
Red top or Green top (sodium or lithium heparin) tube.
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum
Rejection Criteria
Grossly hemolyzed samples are unacceptable for analysis.
Additional Information

Includes: Glucose, Urea Nitrogen, Creatinine, Calcium, Sodium, Potassium, Chloride, CO2 and Anion Gap. Each of these tests except the anion gap may be ordered individually. The Jaffe reaction used for creatinine on the Advia 1800 can exhibit a positive bias or interference with a number of different compounds. The most common are high levels of ascorbic acid and certain cephalosporin antibiotics (Cefpirone, Cefoxitin, Cefazolin, and Cephalothin). Patients may exhibit fairly dramatic changes in serum creatinine (0.5 - 1.0 mg/dL increases) if samples happen to be drawn at peak drug levels.

CPT Code
Fee Code
NY State Approved