Surfactant Dose Calculator
Calculate estimated neonatal surfactant dose volume by weight for common surfactant products. This tool is for respiratory therapy education and must be checked against the provider order, product insert, and facility policy.
Educational Tool Only
Do not use this calculator as a medication order. Surfactant is a neonatal medication administered intratracheally by trained clinicians. Always verify the ordered product, dose, concentration, route, aliquot method, patient weight, vial size, redosing criteria, and institutional policy before administration.
Calculate Surfactant Dose Volume
Choose the product and enter weight. Preset values use commonly listed mL/kg dosing for selected products.
Surfactant Dose Formula
Example: 1.2 kg infant receiving 2.5 mL/kg
Dose volume = 1.2 × 2.5 = 3.0 mL
Common Product Presets Included
| Product | Preset Dose | Notes |
|---|---|---|
| Curosurf / poractant alfa | Initial: 2.5 mL/kg Repeat: 1.25 mL/kg | Product information describes an initial recommended dose of 2.5 mL/kg birth weight and repeat doses of 1.25 mL/kg. |
| Survanta / beractant | 4 mL/kg | Common product dosing is volume-based at 4 mL/kg. |
| Infasurf / calfactant | 3 mL/kg | Product information describes a dose of 3 mL/kg birth weight. |
Dose Follows the Baby’s Weight
For volume-based surfactant dosing, the weight is the multiplier.
If the dose is mL/kg, multiply by kg. A 1 kg infant receives the mL/kg amount. A 2 kg infant receives twice that amount.
Surfactant Can Rapidly Change Lung Mechanics
After surfactant administration, oxygenation and lung compliance may improve quickly. Ventilator pressures, FiO₂, and monitoring may need prompt reassessment according to the care team and facility protocol.
Product, dose, route, aliquot method, weight, and order.
SpO₂, heart rate, tube position, breath sounds, and ventilator pressures.
Desaturation, bradycardia, airway obstruction, reflux into ET tube, or rapid compliance change.
FiO₂ and pressures may need adjustment as lung mechanics improve.
Avoid These Errors
1200 g is 1.2 kg, not 1200 kg. The calculator converts grams if selected.
Different surfactants have different volume-based dosing.
Curosurf initial and repeat doses are different.
Always follow the provider order, product insert, and facility policy.
Connect Surfactant to Oxygenation Severity
Surfactant therapy connects neonatal respiratory distress, oxygenation support, MAP, OI/OSI, and ventilator management.