Which of the following is not a component of the total anion content of serum?

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Multiple Choice

Which of the following is not a component of the total anion content of serum?

Explanation:
Total serum anion content reflects every species carrying a negative charge at physiological pH. This includes small inorganic anions like chloride and bicarbonate, organic acids such as lactate and acetoacetate, and even proteins (like albumin) that have a net negative charge due to their amino acid residues. Iron, however, is a positively charged ion (Fe2+ or Fe3+) and functions as a cation, not an anion, so it does not contribute to the total anion content of serum.

Total serum anion content reflects every species carrying a negative charge at physiological pH. This includes small inorganic anions like chloride and bicarbonate, organic acids such as lactate and acetoacetate, and even proteins (like albumin) that have a net negative charge due to their amino acid residues. Iron, however, is a positively charged ion (Fe2+ or Fe3+) and functions as a cation, not an anion, so it does not contribute to the total anion content of serum.

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