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

SNAP-II

Score for Neonatal Acute Physiology II: six physiological variables of the first 12 hours, 0–115 points

Lowest mean arterial pressure (mmHg)
Lowest temperature
PaO₂/FiO₂ in mmHg (first divide PaO₂ in mmHg by FiO₂ as a decimal)

Example: PaO₂ 60 mmHg at FiO₂ 0.4 → 60 ÷ 0.4 = 150 mmHg. The original table gives the ratio in units of 100 (2.49 = 249 mmHg).

Lowest serum pH
Multiple seizures
Urine output (ml/kg/h)

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.

Frequently asked questions

SNAP-II: What does this calculator compute?

SNAP-II (Richardson 2001): illness severity of a newborn from the lowest blood pressure, lowest temperature, PaO₂/FiO₂, lowest pH, seizures and urine output in the first 12 hours after admission – total 0–115 with classification according to validation studies.

SNAP-II: Which sources is this calculator based on?

Richardson DK, Corcoran JD, Escobar GJ, Lee SK: SNAP-II and SNAPPE-II: Simplified newborn illness severity and mortality risk scores (J Pediatr 138:92–100) (2001); Harsha SS, Archana BR: 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) (2015)