Dialysis Technician Practice Exam

Which electrolyte's target lab value is 3.5-5.5 mEq/L?

1. Magnesium

2. Sodium

3. Potassium

4. Calcium

The correct answer is: Potassium

The target lab value of 3.5-5.5 mEq/L specifically refers to potassium, which is a critical electrolyte in the body. Potassium plays a vital role in numerous physiological processes, including maintaining normal heart rhythm, nerve function, and muscle contraction. In clinical practice, monitoring potassium levels is particularly essential for patients undergoing dialysis, as these individuals are at an increased risk of hyperkalemia (high potassium levels) or hypokalemia (low potassium levels). The correct range of 3.5-5.5 mEq/L reflects the normal physiologic levels necessary for these crucial bodily functions. Magnesium, sodium, and calcium have different normal ranges and roles within the body. For example, magnesium has a typical range of about 1.5-2.5 mEq/L, sodium usually falls between 135-145 mEq/L, and calcium levels are generally considered normal within the range of 8.5-10.5 mg/dL. These differing values underscore the importance of accurately monitoring electrolytes to ensure the proper management of patients, especially those on dialysis. Understanding these reference ranges is fundamental for a dialysis technician to ensure patient safety and optimal care.