A doctor calls the nurse to obtain the daily laboratory results of a client who is receiving parenteral nutrition. Which is the most important laboratory result for the nurse to present to the doctor?

Appeared in: RAK Nursing Officer - 2019

Explanation

Parenteral nutrition (PN) can cause rapid and significant fluid and electrolyte shifts, making daily monitoring of serum electrolytes the highest priority.
Patients receiving PN are at high risk for refeeding syndrome, a life-threatening condition characterized by severe electrolyte depletion (hypophosphatemia, hypokalemia, hypomagnesemia).
Monitoring serum electrolytes allows for timely adjustments to the PN formula and intervention to prevent complications like cardiac arrhythmias, respiratory failure, and seizures.

Option A: While infection is a risk associated with the central venous catheter used for PN, monitoring the WBC count is not the most critical daily lab related to the immediate metabolic effects of the PN solution itself.
Option C: Arterial blood gas (ABG) levels are not routinely monitored daily for all patients on PN. They are checked only when there is a specific concern for an acid-base imbalance or respiratory compromise.
Option D: Haemoglobin and haematocrit levels reflect the oxygen-carrying capacity and are indicators of anemia or hydration status. These values do not typically change rapidly on a daily basis due to PN administration.

Clinical Relevance

Nursing practice connection: Use the key finding related to Laboratory monitoring for parenteral nutrition to guide bedside assessment, documentation, and the next nursing action.
Nurses play a vital role in managing patients on PN by meticulously monitoring laboratory values, assessing for signs of complications like refeeding syndrome, and communicating critical findings to the healthcare team promptly.
Failure to recognize and act on electrolyte imbalances in a patient receiving PN can lead to severe morbidity and mortality.
What if? If the patient had been on stable PN for several months at home, the frequency of lab monitoring might be reduced to weekly or bi-weekly, but daily monitoring is standard for new or unstable patients in the hospital.

How to Approach the Question

First, identify the core concept of the question, which is the care of a client on parenteral nutrition (PN).
Next, analyze the specific question being asked: What is the 'most important' daily laboratory result to report?
Consider the primary function and major risks of PN. PN is a concentrated formula that provides all nutrients intravenously, bypassing the digestive system.
Evaluate each option based on its relationship to the immediate risks of PN. The biggest immediate risk is metabolic instability, specifically fluid and electrolyte shifts.
Eliminate options that are less directly or acutely affected by PN on a daily basis. WBC (infection), ABGs (not routine), and Hgb/Hct (long-term) are important but are secondary to the immediate metabolic impact.
Conclude that serum electrolytes are the most critical daily lab because of the high risk of refeeding syndrome and other life-threatening electrolyte imbalances.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 783-785

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 79-81

Practise the full RAK Nursing Officer - 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.