A nurse is reviewing the laboratory test results for a male client who has an elevated temperature. The nurse should identify which of the following findings is a manifestation of dehydration?

A. Rinsing the client's mouth helps to remove oral contaminants, ensuring that the sputum specimen is representative of the respiratory secretions.
B. Obtaining the specimen in the evening is not a specific requirement; the best time to collect the specimen is when the client has the most productive cough.
C. Saving the sputum specimen in a clean container is essential to prevent contamination. However, a sterile container is usually required.
D. Collecting the sputum specimen after a meal might induce coughing but can also contaminate the specimen with food particles.

A. Metabolic acidosis is characterized by a primary decrease in bicarbonate (HCO₃⁻) levels, which is not typically a direct result of COPD. However, if a patient with COPD has an additional condition like kidney failure or severe sepsis, they could potentially develop metabolic acidosis. But, this is not the primary concern in COPD.
B. Respiratory alkalosis is caused by hyperventilation, where there is excessive loss of CO₂ leading to an increase in blood pH. This is less common in COPD patients, as they typically have difficulty exhaling CO₂ rather than hyperventilating.
C. Metabolic alkalosis involves an increase in blood pH due to elevated bicarbonate levels or loss of acid. This is not typically associated with COPD, unless there is an unrelated condition causing metabolic alkalosis.
D. COPD is characterized by impaired airflow and reduced ability to expel carbon dioxide (CO₂) effectively. As CO₂ accumulates in the blood, it combines with water to form carbonic acid, which lowers the blood pH, leading to respiratory acidosis.