| Test Name: |
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Anion Gap
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| Test Code(s): |
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LYTS / LYTE
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| CPT Code(s): |
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See Electrolytes Panel
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| Test Description: |
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Included In: Electrolytes panel, Basic Metabolic Panel (BMP) and Comprehensive Metabolic Panel (CMP)
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| Methodology: |
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Ion Selective Electrode and/or Enzymatic
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Instructions: |
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Tube must be at least one quarter full.
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| Collection Container: |
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Preferred: Green cap with yellow ring (PST)
Also Acceptable:
Green top,
Red cap with yellow ring (SST),
Red top
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| Collection Volume: |
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Preferred: 1 mL
Pediatrics: 0.5 mL
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| Sample Analyzed: |
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Plasma or serum
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| Volume Required: |
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Preferred: 0.5 mL
Pediatrics: 0.2 mL
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| Specimen Processing: |
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Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Tube must be at least one quarter full. Refrigerate specimen.
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| Specimen Transport: |
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Transport specimen to the laboratory. Transport with coolant pack if coming from outreach location.
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Interpretation
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Reference Interval:
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0 days and up: 7-14 mmol/L
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| Additional Information: |
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The anion gap is calculated by subtracting the sum of the chloride and total carbon dioxide from the sodium result.
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