GIR calculator (glucose infusion rate)
Calculate neonatal or pediatric glucose infusion rate (GIR) in mg/kg/min from weight, infusion rate, and dextrose concentration. Choose dextrose % or mg/mL.
Clinical disclaimer
Pediatric GIR formula
Convert dextrose and IV rate into mg/kg/min before interpreting the trend
For dextrose percent labels such as D5 or D10:
GIR (mg/kg/min) = (Rate (mL/h) x Dextrose % x 10) / (Weight (kg) x 60)
Simplified: GIR = (Rate x D%) / (6 x Weight). If the concentration is entered in mg/mL, use (Rate x mg/mL) / (Weight x 60).
Example: a 3.2 kg infant on D10 at 6 mL/h gives GIR = 3.13 mg/kg/min.
Use actual weight in kilograms.
Use the IV pump's rate in mL per hour.
How it works
Glucose infusion rate (GIR) describes how many milligrams of glucose a child receives per kilogram of body weight per minute. It is calculated from the IV infusion rate, the concentration of dextrose in the fluid, and the child's weight.
When you enter dextrose as a percentage (e.g., D10, D5W), the calculator converts to mg/mL using mg/mL ≈ 10 × % and applies:
- GIR (mg/kg/min) = (Rate (mL/h) × Dextrose % × 10) / (Weight (kg) × 60)
- Simplified: GIR = (Rate × D%) / (6 × Weight)
If you instead enter glucose directly in mg/mL, the calculator uses:
- GIR (mg/kg/min) = (Rate (mL/h) × mg/mL) / (Weight (kg) × 60)
Results are rounded to two decimal places for display. Internally, the math is performed in SI units with consistent conversions.
Interpretation & typical ranges
GIR is only one piece of a child's overall glucose and nutrition support. Interpretation depends on age, clinical stability, concurrent enteral intake, and institutional protocols.
- Very low GIR: may be inadequate to meet basal glucose needs, especially in preterm or critically ill infants.
- Moderate GIR: typically used as a starting point for stable patients, then titrated based on blood glucose and overall nutrition goals.
- Higher GIR: increases the risk of hyperglycemia, fluid overload, and line‑related complications and should be guided by local NICU or PICU protocols.
Always follow your unit's published GIR targets and consult pediatric endocrinology or nutrition teams when adjusting long‑term parenteral glucose support.
Bedside workflow
- Verify current weight (kg), infusion rate (mL/h), and dextrose concentration source (D% vs mg/mL).
- Calculate GIR and compare against age- and context-specific local targets.
- If adjusting GIR, change one major variable at a time when possible and document rationale.
- Recheck glucose/electrolytes after meaningful changes and reassess trend, not a single value.
Worked example
Example: 3.2 kg infant on D10 at 6 mL/h.
- Using simplified formula: GIR = (Rate × D%) / (6 × Weight)
- GIR = (6 × 10) / (6 × 3.2) = 60 / 19.2 ≈ 3.13 mg/kg/min
- Use this number with local target ranges and glucose trend to decide next adjustments.
Safety notes & red flags
- Confirm dextrose concentration and units (D5 vs D10 vs D25) on the label before calculating.
- Use appropriate access (peripheral vs central line) for higher dextrose concentrations per local policy.
- Monitor serum glucose and electrolytes regularly, especially after titrating GIR up or down.
- Re‑check all weight entries and conversions (kg vs lb) when calculations seem unexpectedly high or low.
Immediate escalation triggers
- Persistent hypo- or hyperglycemia despite expected GIR adjustments.
- Rapid glucose swings with hemodynamic instability or neurologic symptoms.
- Uncertainty about concentration, access safety, or infusion pump accuracy.
- Mismatch between calculated GIR and bedside response trajectory.
Common calculation pitfalls
- Entering weight in pounds instead of kilograms.
- Confusing D10 (10%) with 10 mg/mL (which are not equivalent).
- Changing both rate and concentration at once, making response attribution difficult.
- Reacting to one glucose value without considering trend and clinical context.
Clinical background
GIR is a core parameter in neonatal and pediatric intensive care where many children receive some degree of parenteral glucose support. Very low GIR can contribute to hypoglycemia and inadequate energy delivery, while excessively high GIR increases the risk of hyperglycemia, osmotic diuresis, electrolyte shifts, and complications related to high‑concentration dextrose infusions.
Safe targets depend on gestational age, postnatal age, underlying conditions, and the proportion of calories being delivered parenterally versus enterally. Many units publish GIR ranges for different age groups and clinical scenarios (e.g., stressed preterm infant vs. stable older child). Use this calculator as a precise way to relate rate and concentration to mg/kg/min, then interpret the number in light of those local ranges and the child's evolving clinical picture.
When adjusting GIR, change one variable at a time when possible, re‑check serum glucose after meaningful adjustments, and document both the numeric GIR and the rationale for changes so that the care team can follow the trajectory across shifts.
Shift handoff checklist
- Current GIR value and exact inputs (weight, rate, concentration units).
- Target GIR range for this patient and rationale.
- Recent glucose/electrolyte trend with timing of next check.
- Recent changes made and observed clinical response.
- Escalation trigger threshold and team ownership.
Reassessment cadence after GIR changes
- After initiating or materially changing GIR: recheck glucose in the same clinical block per unit protocol (often within 30-60 minutes).
- Stable trajectory: continue interval checks at protocol cadence with explicit trend review.
- High volatility, prematurity, or critical illness: shorten intervals and coordinate with unit escalation pathways.
Concentration and access guardrails
- Treat any mismatch between charted dextrose concentration and bag label as a hard stop before recalculating.
- For higher dextrose concentrations, confirm access suitability (peripheral vs central) and local policy limits.
- Do not change both concentration and rate simultaneously unless urgency requires it; if unavoidable, document rationale and close recheck timing.
- Escalate for persistent instability rather than repeatedly increasing GIR without broader diagnostic review.
Related calculators
Frequently asked questions about GIR
GIR is the rate of glucose delivery in mg per kg of body weight per minute. It helps compare different dextrose concentrations and infusion rates on a common scale and is commonly used in neonatal and pediatric intensive care.
Most IV fluid labels and protocols use dextrose percentages (D5, D10, D25). The calculator can work directly with D% or mg/mL; internally it uses the same underlying formula, so you can choose whichever matches how your local protocols are written.
GIR changes should be tied to blood glucose trends, overall nutrition plans, and your unit's written guidelines. After any significant GIR adjustment, re-check serum glucose and watch for fluid and electrolyte shifts.
No. This calculator is decision support only. Always interpret GIR in the context of the child's clinical status and your institution's protocols, and seek specialist input when needed.
Reassess broader causes (sepsis, endocrine/metabolic issues, interruptions in infusion) and escalate to specialist pathways. Do not keep escalating GIR blindly without full review.
Document the new GIR, exact inputs used, why the change was made, and when the next glucose/electrolyte check is due. This keeps cross-shift interpretation consistent and safer.