Glucose infusion rate (GIR) tells clinicians, in a single weight-normalized number, how much glucose an infant or child is receiving per minute from IV dextrose or parenteral nutrition. It is a cornerstone calculation in neonatal and pediatric intensive care, balancing the risk of hypoglycemia against the risk of hyperglycemia and excess lipogenesis.

How GIR is calculated

GIR (mg/kg/min) = (Dextrose% x Rate in mL/hr x 10) / (Weight in kg x 60). Because glucose need scales with body size and metabolic rate, GIR is always expressed per kilogram of body weight per minute rather than as a flat delivery rate.

Every dextrose concentration and rate combination maps to the same physiologic quantity, which is what lets clinicians compare a D10W order at one rate against a D12.5W order at a different rate on equal footing.

Typical neonatal and pediatric GIR targets

Term infants typically start around 4-6 mg/kg/min, while preterm infants often start slightly higher, around 5-8 mg/kg/min, reflecting greater glucose needs and lower glycogen reserves. Parenteral nutrition is commonly advanced in 1-2 mg/kg/min steps toward a goal near 12 mg/kg/min, which approximates the glucose oxidative capacity of a neonate — the point beyond which excess glucose is diverted to fat synthesis and increases carbon dioxide production.

Peripheral IV lines are generally limited to dextrose concentrations up to about 12.5%; reaching higher GIR values at a fixed rate usually requires a higher concentration delivered through a central venous line.

Using the Reverse tab

The Reverse tab solves the same relationship in the other direction: given a target GIR, weight, and dextrose concentration, it returns the infusion rate in mL/hr needed to hit that target. This is useful when adjusting a parenteral nutrition order to reach a new goal GIR without recalculating by hand.

Limitations and when to escalate

This calculator is scoped to neonatal and pediatric IV dextrose and parenteral nutrition. Adult glucose infusion targets are meaningfully lower and are out of scope here — do not apply these bands to adult patients.

It also computes GIR for a single infusion only. If a patient is receiving glucose from more than one source at once (maintenance fluids, PN, and a medication drip mixed in dextrose, for example), the individual GIR contributions must be summed by the care team. Always verify the resulting order with a pharmacist or current prescribing information before administering, and treat any GIR near or above the oxidative ceiling as a trigger for clinician review.