Which components are used to calculate the anion gap in routine laboratory assessment?

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Multiple Choice

Which components are used to calculate the anion gap in routine laboratory assessment?

Explanation:
Anion gap is calculated using the major measured ions in serum: the cations and the anions. The standard approach includes the cations sodium (and often potassium) and the anions chloride and bicarbonate (often labeled as CO2 on chemistry panels). Because bicarbonate is the main uncompensated base in blood, using these four components lets you estimate unmeasured anions. So, the components are sodium, potassium, chloride, and bicarbonate (CO2). That’s why this option fits the calculation. Other options mix in substances not part of the screen for the gap—glucose, calcium, or magnesium—or omit a key component like bicarbonate.

Anion gap is calculated using the major measured ions in serum: the cations and the anions. The standard approach includes the cations sodium (and often potassium) and the anions chloride and bicarbonate (often labeled as CO2 on chemistry panels). Because bicarbonate is the main uncompensated base in blood, using these four components lets you estimate unmeasured anions.

So, the components are sodium, potassium, chloride, and bicarbonate (CO2). That’s why this option fits the calculation.

Other options mix in substances not part of the screen for the gap—glucose, calcium, or magnesium—or omit a key component like bicarbonate.

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