What is the normal bicarbonate level (HCO3-) range in mmHg?

The normal bicarbonate level (HCO3-) range in the blood is primarily associated with assessing a person's metabolic status and acid-base balance. The typical reference range for bicarbonate concentration is 22-26 mmHg. This range is important for evaluating conditions like metabolic acidosis or alkalosis, as bicarbonate acts as a buffer in the blood, helping to maintain the pH within a narrow range.

Analyzing the other options shows that the values provided either fall below or above the established normal range. The lower end (18-22 mmHg) would be indicative of potential metabolic acidosis, while levels in the upper range (24-28 mmHg and 26-30 mmHg) would suggest conditions that may be influenced by metabolic alkalosis, which would be beyond the normal physiological parameters. Thus, the correct choice aligns with standard laboratory practice and physiological understanding of bicarbonate levels.