Health Measurements
Anion Gap Calculator
Anion Gap Calculator calculate serum anion gap with and without potassium from entered electrolytes.
Health Measurements
Anion Gap Calculator
Calculate serum anion gap with and without potassium from entered electrolytes.
Formula
AG without K = Na - Cl - HCO3; AG with K = Na + K - Cl - HCO3.
About the Anion Gap Calculator
Calculate serum anion gap with and without potassium from entered electrolytes.
How the Anion Gap Calculator Works
Both common conventions are calculated from the same electrolyte values so the laboratory's reported convention can be compared directly.
Formula
AG without K = Na - Cl - HCO3; AG with K = Na + K - Cl - HCO3.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Sodium (required) - enter in mmol/L.
- Potassium (required) - enter in mmol/L.
- Chloride (required) - enter in mmol/L.
- Bicarbonate (required) - enter in mmol/L.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Anion gap without potassium (mmol/L)
- Anion gap with potassium (mmol/L)
Anion Gap Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Sodium | 140 mmol/L |
| Potassium | 4 mmol/L |
| Chloride | 104 mmol/L |
| Bicarbonate | 24 mmol/L |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Reference intervals depend on laboratory methods, albumin, and whether potassium is included. Clinical acid-base interpretation requires the full patient context.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Formula References
Frequently Asked Questions
What does the Anion Gap Calculator calculate?
Calculate serum anion gap with and without potassium from entered electrolytes.
Which formula does the Anion Gap Calculator use?
AG without K = Na - Cl - HCO3; AG with K = Na + K - Cl - HCO3.
What should I verify before using this result?
Reference intervals depend on laboratory methods, albumin, and whether potassium is included. Clinical acid-base interpretation requires the full patient context.