SNAPPE-II
SNAPPE-II (Richardson 2001): a 0–162 neonatal illness-severity score from MAP, temperature, PaO2/FiO2, pH, seizures, urine output, birth weight, SGA status, and 5-minute Apgar.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Mean arterial pressure
- 25
- Lowest temperature
- 34.5
- PaO2
- 50
- FiO2
- 80
- Lowest pH
- 7.05
- Urine output
- 0.5
- Birth weight
- 800
- 5-minute Apgar
- 5
Result: SNAPPE-II 89/162: high illness severity -- higher totals carry a higher neonatal mortality risk.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Physiology
- mean BP, lowest temperature, PaO2(mmHg)/FiO2(%) ratio, lowest pH, multiple seizures, urine output -- each banded to its point value.
- Perinatal
- birth weight, small-for-gestational-age (<3rd percentile), and a 5-minute Apgar under 7 add the perinatal-extension points.
- 0-162
- higher totals carry a higher neonatal mortality risk; unmeasured items score their normal (0-point) band.
What you enter
- Mean arterial pressure (mmHg)
- Lowest temperature (°C)
- PaO2 (mmHg)
- FiO2 (%)
- Lowest pH
- Seizures
- Urine output (mL/kg/hr)
- Birth weight (g)
The other 2 fields
- Small for gestational age (< 3rd percentile)
- 5-minute Apgar
How this is calculated
Richardson DK, Corcoran JD, Escobar GJ, Lee SK. SNAP-II and SNAPPE-II: simplified newborn illness severity and mortality risk scores. J Pediatr. 2001;138(1):92-100. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.