What should a nurse expect to find in a client with respiratory alkalosis when reviewing lab values?

• A. CO2 28
• B. CO2 50
• C. Bicarbonate 25
• D. pH 7.30

Answer: (A)

In a client with respiratory alkalosis, the expected lab findings include a decreased level of carbon dioxide (CO2) due to hyperventilation. When a patient is hyperventilating, they exhale more CO2 than the body is producing, leading to a lower concentration of CO2 in the blood. This decrease in CO2 levels will result in a pH that is higher than normal, indicating alkalosis.

The specific value of CO2 at 28 mmHg aligns with this condition, as values lower than the normal range (35-45 mmHg) indicate respiratory alkalosis. In contrast, a CO2 level of 50 would indicate respiratory acidosis, while a bicarbonate level of 25 would typically be considered normal and not directly indicative of alkalosis when viewed alone. Additionally, a pH of 7.30 suggests acidosis, which is inconsistent with respiratory alkalosis.

Thus, identifying CO2 at 28 mmHg correctly points towards the diagnosis of respiratory alkalosis, making it the appropriate expectation during lab value reviews for such a condition.