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Calculation of the Serum Anion Gap

Purpose:

To use the anion gap to to identify a patient with an electrolyte imbalance.

Specialty:

Endocrinology
Clinical Laboratory
Emergency Medicine
Critical Care

Objective:

laboratory tests

ICD-10:

E87

Description:

The electrolytes in the serum must be in equilibrium. The major positively charged electrolytes (sodium, potassium) and negatively charged electrolytes (chloride and bicarbonate) are commonly measured in screening chemical tests. "Unmeasured" anions or cations make up the difference from electroneutrality.

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