Which finding in a patient's fluid and electrolyte status should be reported to the doctor?

The finding of potassium at 5.4 mEq/L should be reported to the doctor because this level is slightly elevated. Normal potassium levels typically range from 3.5 to 5.0 mEq/L. Elevated potassium, known as hyperkalemia, can lead to serious complications, including cardiac arrhythmias. It is crucial for healthcare providers to monitor potassium closely, especially in patients with conditions such as kidney disease, where potassium may accumulate and exceed safe levels.

In contrast, the other values presented—sodium at 135 mEq/L, calcium at 9.5 mg/dL, and magnesium at 1.8 mEq/L—fall within normal ranges. Sodium is typically considered normal between 135 and 145 mEq/L, calcium levels are generally normal between 8.5 and 10.5 mg/dL, and magnesium levels are normally between 1.5 and 2.5 mEq/L. Thus, although all these values should be monitored as part of comprehensive fluid and electrolyte status, it is the slightly elevated potassium level that raises immediate concern and necessitates communication with the physician for further evaluation and potential intervention.