PEWS Calculator | Modified Pediatric Early Warning Score
Score pediatric early warning risk with this PEWS calculator using age-adjusted vitals, oxygenation, LOC, IV fluid exposure, and PMH factors.
Last reviewed: 2026-02-26
Clinical disclaimer
Age bands follow completed months. If at a boundary, follow local policy for band selection.
How modified PEWS works
The modified PEWS tool sums age-based vital sign points with clinical exam factors and past medical history risk points. Higher totals and rising trends indicate higher concern for deterioration.
- Heart rate, respiratory rate, and systolic BP are scored by age band.
- Oxygen points reflect saturation and oxygen therapy requirements.
- LOC, IV fluids, and PMH factors add additional risk points.
Rapid bedside workflow
- Select correct age band and enter current bedside values from the same assessment window.
- Score vital/exam domains and PMH modifiers, then identify highest-risk drivers.
- Compare total and domain-level risk with current trajectory and response to interventions.
- Set explicit next reassessment interval and escalation threshold per local pathway.
Age bands used
- 0-2 months
- 3-5 months
- 6-9 months
- 9-12 months
- 12-18 months
- 18-24 months
- 2-3 years
- 3-4 years
- 4-6 years
- 6-8 years
- 8-12 years
- 12-15 years
- Over 15 years
Bands follow completed months; if at a boundary, follow local guidance.
Interpreting scores
- Higher totals and rising trends suggest higher risk and need for escalation.
- Use the full clinical context, including mental status and perfusion.
- Thresholds for action vary by institution and care setting.
Reassessment cadence
- After any escalation intervention (oxygen, fluids, bronchodilator, rapid review): repeat score in the same care block.
- If stable trajectory: continue interval rescoring per unit policy.
- If worsening trend or caregiver/team concern: immediate reassessment and escalation regardless of prior category.
Shift handoff checklist
- Current total score plus domain drivers responsible for risk category.
- Trend versus prior score(s) with time intervals.
- Interventions performed and observed response.
- Next reassessment time and explicit escalation trigger.
Compare with
- Bedside PEWS calculator: use when your site follows the Bedside PEWS scoring structure.
- Pediatric vital signs chart: use when abnormal age-band vitals need a quick reference before scoring.
- Pediatric SIRS calculator: use when fever, infection, or systemic inflammatory criteria are the adjacent concern.
Related calculators
References
Frequently asked questions
Modified PEWS is a pediatric early warning score that combines age-based vitals with exam findings and risk factors to identify children at risk of clinical deterioration.
This tool uses the YKHC age bands from 0-2 months through over 15 years, with separate score cards for each band.
Oxygen scoring uses the measured SpO2 and assigns 2 points if the child is on supplemental oxygen, regardless of saturation.
PMH points are added only when those risk factors are present. If none apply, leave all PMH boxes unchecked.
Document total score, domain drivers, intervention timing, and trend direction. This is more reliable for handoff and escalation than a total score alone.