This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

SNAPPE-II

SNAP-II plus birth weight, SGA and 5-minute Apgar – mortality risk, 0–162 points

Lowest mean arterial pressure (mmHg)

≥ 30 0 20–29 9 < 20 19

Lowest temperature

> 35.6 °C (> 96 °F) 0 35.0–35.6 °C (95–96 °F) 8 < 35.0 °C (< 95 °F) 15

PaO₂/FiO₂ (mmHg ÷ FiO₂ as a decimal number; in the source in units of 100)

Example: PaO₂ 60 mmHg at FiO₂ 0.4 → 150 mmHg = 1.5.

> 2.49 (> 249 mmHg) 0 1.0–2.49 (100–249 mmHg) 5 0.3–0.99 (30–99 mmHg) 16 < 0.3 (< 30 mmHg) 28

Lowest serum pH

≥ 7,20 0 7,10–7,19 7 < 7,10 16

Multiple seizures

no 0 yes 19

Urine output (ml/kg/h)

≥ 1,0 0 0,1–0,9 5 < 0,1 18

Birth weight (g)

≥ 1000 0 750–999 10 < 750 17

Small for gestational age (< P3)

no 0 yes 12

Apgar score at 5 minutes

≥ 7 0 < 7 18

Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.

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Sources

SNAP-II and SNAPPE-II: Simplified newborn illness severity and mortality risk scores (J Pediatr 138:92–100) Richardson DK, Corcoran JD, Escobar GJ, Lee SK, 2001. Original paper (only abstract freely accessible)
SNAPPE-II (Score for Neonatal Acute Physiology with Perinatal Extension-II) in predicting mortality and morbidity in NICU (J Clin Diagn Res 9:SC10–SC12) Harsha SS, Archana BR, 2015. Validation study (open access; complete reproduction of the points table according to Richardson 2001)

Scientific basis last reviewed: September 2026.

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Note

Calculation aid for healthcare professionals. Percentiles and z-scores describe the position of a measured value in the reference population; clinical assessment remains with the treating physician.