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Test Code 1694339506 Anion Gap, Calculated

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

This test is a calculation and is not orderable independently.

Anion Gap = Na - (Cl + CO2)

Specimen Requirements

See specimen requirements in:
LAB15 Basic Metabolic Panel (BMP)

LAB17 Comprehensive Metabolic Panel (CMP)

LAB5567 Electrolyte Panel, Blood

LAB16 Electrolyte Panel, Plasma

LAB19 Renal Function Panel

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:
STAT: 1 hour after receipt in laboratory 
Routine: 2 to 4 hours after receipt in laboratory

Reference Values

2-15 mmol/L
Critical result (automatic call-back): >25 mmol/L

Literature Reference:

Cheng S, Schindler E, Scott MG. Disorders of Water Electrolyte, and Acid-Base Metabolism. In Tietz textbook of Clinical Chemistry 6th ed: Chapter 60, P. 1324, Elsevier, St. Louis, MO 2018.

Additional Information

For BJH Laboratory Use Only
Alternate Tube:

1 dark green-top (lithium heparin) tube
1 red-top tube
Analyte Stability:

See individual test listings in Analyte Stability Chart in Special Instructions.

Laboratory Processing Instructions:
Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days. 

Test performed in South County Siteman and Ambulatory Cancer Building Lab.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days.  

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Anion Gap 10466-1