Final answer:
The nurse would immediately report a potassium level of 2.7 mEq/L option (C) to the health care provider, as it indicates hypokalemia which can lead to serious health risks.
Step-by-step explanation:
The laboratory result that a nurse would immediately report to the primary health care provider is C. Potassium 2.7 mEq/L. This result indicates hypokalemia, a condition where the potassium level in the blood is lower than the normal range. Potassium is a critical electrolyte for cellular function, and its normal blood plasma reference value is typically in the range of 3.5 to 5.0 mEq/L. A level of 2.7 mEq/L is significantly below this range and can have serious implications for cardiac and neuromuscular function.
In a clinical setting, potassium is one of the primary electrolytes that is closely regulated and monitored. It's important to manage potassium levels properly, especially during IV fluid and electrolyte therapy, to prevent potential complications such as cardiac arrhythmias. Proper concentration and delivery of potassium, like the instance where a physician orders 0.5% KCl for hypokalemia, is crucial for patient care.