Which laboratory values are routinely assessed to evaluate tolerance of parenteral nutrition?

Which laboratory values are routinely assessed to evaluate tolerance of parenteral nutrition?

• A. Blood glucose, electrolytes, urea nitrogen, complete blood count, and hepatic enzyme studies
• B. Daily weights
• C. Chest X-ray and ultrasound
• D. Serum albumin alone

Answer: (A)

Monitoring tolerance to parenteral nutrition hinges on lab values that show how the body is handling the nutrient load and how organs are coping with it. Regularly checking blood glucose is essential because PN provides a high dextrose load and can cause hyperglycemia, requiring adjustment of the infusion or insulin. Electrolytes need close monitoring since shifts in fluid and nutrient delivery can disrupt levels of potassium, phosphate, magnesium, calcium, and other electrolytes, risking arrhythmias, weakness, or muscle problems if imbalanced. Urea nitrogen gives a quick sense of protein metabolism and renal function, helping you gauge whether protein intake is appropriate and whether dehydration or catabolism is occurring. A complete blood count is useful for detecting infection or inflammatory responses, which are important to watch for in patients with IV lines and PN therapies. Hepatic enzyme studies help identify PN-related liver changes such as cholestasis or steatosis, guiding adjustments to lipid content and overall PN strategy. Daily weights can inform fluid status but are not a laboratory value, while chest X-ray or ultrasound aren’t routine tools for PN tolerance. Serum albumin alone isn’t a reliable short-term marker of PN tolerance because it’s influenced by many factors and does not reflect current nutritional adequacy.

Monitoring tolerance to parenteral nutrition hinges on lab values that show how the body is handling the nutrient load and how organs are coping with it. Regularly checking blood glucose is essential because PN provides a high dextrose load and can cause hyperglycemia, requiring adjustment of the infusion or insulin. Electrolytes need close monitoring since shifts in fluid and nutrient delivery can disrupt levels of potassium, phosphate, magnesium, calcium, and other electrolytes, risking arrhythmias, weakness, or muscle problems if imbalanced. Urea nitrogen gives a quick sense of protein metabolism and renal function, helping you gauge whether protein intake is appropriate and whether dehydration or catabolism is occurring. A complete blood count is useful for detecting infection or inflammatory responses, which are important to watch for in patients with IV lines and PN therapies. Hepatic enzyme studies help identify PN-related liver changes such as cholestasis or steatosis, guiding adjustments to lipid content and overall PN strategy.

Daily weights can inform fluid status but are not a laboratory value, while chest X-ray or ultrasound aren’t routine tools for PN tolerance. Serum albumin alone isn’t a reliable short-term marker of PN tolerance because it’s influenced by many factors and does not reflect current nutritional adequacy.