Learn Anion Gap Medical Calculator, Example

Anion gap (AG or AGAP) is a value calculated using the results of an electrolyte panel. It is used to help distinguish between anion-gap and non-anion-gap metabolic acidosis.

Learn Anion Gap Medical Calculator, Example

Definition:

Anion gap (AG or AGAP) is a value calculated using the results of an electrolyte panel. It is used to help distinguish between anion-gap and non-anion-gap metabolic acidosis.

Formula:

Anion Gap = Na+ - (Cl- + HCO3-) Anion Gap With K = (Na+ + K+) - (Cl- + HCO3-) Delta Gap = [Na+ - (Cl- + HCO3-)] - 12

Example:

A 60-year-old man was found in head CT Scan, the serum Chemistry panel: Na+ 129, Cl- 95, HCO3- 10 and K+ 5

Solution:

Anion Gap Calculation
Anion Gap Na+ - (Cl- + HCO3-)
129 - (95 + 10)
129 - 105
24
Anion Gap Calculation with K
Anion Gap with K (Na+ + K+) - (Cl- + HCO3-)
(129 + 5) - (95 + 10)
134 - 105
29
Delta Gap Calculation
Delta Gap [Na+ - (Cl- + HCO3-)] - 12
[129 - (95 + 10)] - 12
[129 - 105] - 12
24 - 12
12

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