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Arterial Blood Gas (ABG)

Base Excess

Normal range -2-2 mEq/L (-2-2 mmol/L SI). Specimen: Arterial blood (calculated).

Also known as: BE.

-2-2 mEq/LReference range

Reference range

ConventionalmEq/L
-22
SImmol/L
-22

Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Base Excess; those can be narrower than the band shown.

Base Excess reference range, specimen, and conversion details
SpecimenArterial blood (calculated)
Conventional range-2-2 mEq/L
SI range-2-2 mmol/L
Conversion factor×1 (conventional → SI)
PanelArterial Blood Gas (ABG)

Convert any Base Excess result between units on the unit converter.

What is the normal range for Base Excess?

The standard teaching reference range for Base Excess is -2-2 mEq/L in conventional units, or -2-2 mmol/L in SI units. This value is measured in arterial blood (calculated).

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.

At the bedside

Nursing considerations

  • Quantifies the metabolic contribution to acid-base status; negative = base deficit.
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