Test Overview

Test Methodology

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Test Usage

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Reference Range*

See individual tests. Estimated Glomerular Filtration Rates (eGFR) for both an African American and a non-African American individual calculated using the MDRD study equation will be reported with serum creatinine levels ordered alone or as part of a panel for patients aged 18 - 100 years. A GFR estimate between 15 and 59 mL/min for >= 3 months is classified as chronic kidney disease (Stage 3 or 4).

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

The MDRD formula for estimation of GFR (eGFR) was developed in a population of adults with slowly-declining or stable reduced kidney function. The MDRD formula should not be used to predict eGFR in unstable patients or in children. The GFR estimate can be interpreted accurately only during a steady state of creatinine balance. The GFR estimate will overestimate true GFR if serum creatinine is rising (such as in acute kidney failure) and will underestimate true GFR if serum creatinine is declining (such as in resolution of acute kidney failure). The EGFR should not be used for pharmacy drug dosing.

Test Details

Days Test Performed

Daily, 24 hours

Analytic Time

2 hours

Soft Order Code

BASIC

MiChart Code

Basic Metabolic Panel

Synonyms

Synonyms

CALCIUM
Chemistry Profile, Basic Metabolic Panel
CHLORIDE
CO2
CREATININE
GLUCOSE
Metabolic Panel, Basic
POTASSIUM
Profile, Basic Metabolic
SODIUM
UREA NITROGEN
BMP
Basic Metabolic Panel
CAL
CHLOR
CREAT
GLUC
POT
SOD
UN
EGFR GLOMERULAR FILTRATION RATE

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Laboratory

Chemical Pathology

STAT Availability

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

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Specimen Requirements

Offsite 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.

Rejection Criteria

Grossly hemolyzed samples are unacceptable for analysis.

Container

Yellow Top Tube

Normal Volume

1 mL serum

Minimum Volume

0.5 mL serum

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.

Billing Information

Fee Codes


CPT Code

80048

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