Calculation of the glucose infusion rate for parenteral nutrition

Calculate grams of glucose in the parenteral nutrition prescription	Energy (kcals) from carbohydrates ÷ 3.4 kcal/g = g glucose
Convert to milligrams of glucose	G glucose × 1000 = mg glucose
Calculate milligrams of glucose per kilogram	Mg glucose ÷ body weight (kg) = mg glucose/kg
Calculate milligrams of glucose per kilogram per minute = GIR	Mg glucose/kg ÷ minutes of infusion = mg glucose/kg/minute (where minutes of infusion = 1440 if infusion is continuous over 24 hours)

GIR: glucose infusion rate.

Courtesy of Susan Baker, MD, and Robert Baker, MD.

Graphic 90629 Version 4.0

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