Dialysis Technician Practice Exam

Which of the following lab values is within the target range for phosphorous?

1. 2.0-3.0 mg/dL

2. 3.5-5.5 mg/dL

3. 4.5-6.0 mg/dL

4. 5.0-5.5 mg/dL

The correct answer is: 3.5-5.5 mg/dL

The target range for phosphorus in the blood typically falls between 3.5 to 5.5 mg/dL. This range is important for maintaining various biochemical functions in the body, including energy transfer, bone mineralization, and the formation of nucleic acids. Phosphorus levels outside this range can indicate various health issues; too low levels may suggest malnutrition or hormonal imbalances, while elevated levels can be associated with kidney dysfunction, as the kidneys are responsible for excreting excess phosphorus. The other ranges presented do not align with the accepted target for phosphorus. A range of 2.0–3.0 mg/dL is below the lower limit of the normal range, indicating a possible deficiency, while the 4.5–6.0 mg/dL range includes higher levels that can be indicative of hyperphosphatemia, and the 5.0–5.5 mg/dL does not encompass the full spectrum of normal values. Therefore, the 3.5–5.5 mg/dL range is essential for maintaining health in patients, especially those undergoing dialysis, who are at greater risk for phosphorus imbalances.