Calculates base deficit as the negative of base excess.
Overview
Calculates base deficit as the negative of base excess.
Clinical Significance
A positive base deficit corresponds to a negative base excess. Interpretation depends on the analyser definition and the wider acid–base picture.
How It Is Calculated
- Base deficit = −base excess.
Interpretation
- A positive base deficit corresponds to a negative base excess. Interpretation depends on the analyser definition and the wider acid–base picture.
Worked Example
Enter a clinically consistent set of values in the displayed units. MedicalC applies: Base deficit = −base excess.
Limitations
- This tool does not establish a diagnosis or mandate treatment.
- Published cut-offs may vary between cohorts and measurement methods.
- Calculation precision cannot compensate for poor source data.
Clinical Pearls
- Trend the result over time where clinically appropriate.
- Record the source values and units alongside the calculated result.
Common Mistakes
- Using the wrong unit.
- Combining measurements obtained at different times.
- Applying a research-derived threshold as a universal treatment trigger.
Frequently Asked Questions
What does this calculator provide?
Calculates base deficit as the negative of base excess.
Can this result be used alone?
No. It must be interpreted with clinical context and appropriate investigations.
What equation is used?
Base deficit = −base excess.
What is the main limitation?
The result depends on valid inputs and may not be calibrated for every population or setting.
References
- Siggaard-Andersen O. The Acid-Base Status of the Blood. — Formula, physiological or validation reference.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026