A nurse is reviewing a client’s complete blood count (CBC) and notes an RBC count of 3.5 million/mm³ and a mean corpuscular volume (MCV) of 102 mm³. Based on these values, the most appropriate action for the nurse would be to:

Choice A rationale
Hypokalemia can cause muscle weakness and cramps, but it does not typically lead to severe muscle spasms causing exhaustion. The patient’s symptoms of lethargy and weakness are more likely related to electrolyte imbalances and dehydration rather than muscle spasms.
Choice B rationale
While low potassium levels can affect cellular metabolism, the primary issue here is not glycolysis. The patient’s symptoms are more consistent with dehydration and electrolyte imbalances rather than a metabolic shift to glycolysis.
Choice C rationale
Hypokalemia can cause cells to become hyperpolarized, leading to muscle weakness and decreased reflexes. However, the patient’s symptoms of lethargy and weakness are more likely due to dehydration and electrolyte imbalances rather than cellular hyperpolarization.
Choice D rationale
Hypernatremia, or high sodium levels, can cause cellular dehydration, leading to symptoms such as lethargy and weakness. The patient’s lab results and clinical presentation are consistent with hypernatremia-induced cellular dehydration, which explains his symptoms.

Choice A rationale
A respiratory rate of 22 breaths per minute is slightly elevated but not necessarily concerning for a client with COPD. COPD patients often have higher respiratory rates due to their chronic lung condition.
Choice B rationale
A temperature of 38°C (100.4°F) indicates a fever, which could be a sign of infection. However, it is not the most concerning finding in a COPD patient.
Choice C rationale
A pulse oximetry reading of 88% is concerning because it indicates hypoxemia. COPD patients often have lower oxygen levels, but a reading below 90% is worrisome and may require supplemental oxygen or other interventions.
Choice D rationale
A blood pressure of 140/90 mmHg is elevated but not immediately concerning in the context of COPD. It is important to monitor, but it is not the most critical finding.