Neonatology

Score for Neonatal Acute Physiology with Perinatal Extension-II (SNAPPE-II) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Lowest mean arterial pressure

Use the worst values during the first 12 hours after neonatal intensive-care admission. The source excluded infants moribund at birth and infants discharged to normal newborn care within 24 hours.

Lowest temperature

Lowest PaO₂/FiO₂ ratio

Original SNAPPE-II expresses PaO₂ (mm Hg) divided by FiO₂ entered as percent, giving thresholds 2.49, 1.00, and 0.30 (equivalent to conventional PaO₂/FiO₂ thresholds 249, 100, and 30 when FiO₂ is a fraction).

Lowest serum pH

Seizures

Urine output

Birth weight

Small for gestational age (<3rd percentile)

5-minute Apgar score <7

Result

Complete all required inputs to calculate the score.

Formula inputs

Lowest mean arterial pressure
Lowest temperature
Lowest PaO₂/FiO₂ ratio
Lowest serum pH
Seizures
Urine output
Birth weight
Small for gestational age (<3rd percentile)
5-minute Apgar score <7

Primary source

Richardson DK et al. SNAP-II and SNAPPE-II: Simplified newborn illness severity and mortality risk scores. J Pediatr. DOI: 10.1067/mpd.2001.109608. PMID: 11148519 (2001)

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