SNAPPE-II Score Calculator

Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics. Includes interpretation, information buttons and a clinical guide.

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SNAPPE-II Score
Clinical Decision Tool

Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.

Enter or select lowest mean blood pressure points.
Enter or select lowest temperature points.
Enter or select lowest pao₂/fio₂ points.
Enter or select lowest serum ph points.
Enter or select multiple seizures.
Enter or select urine output points.
Enter or select birth weight points.
Enter or select small for gestational age.
Enter or select 5-minute apgar points.
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Clinical Decision Support Only

MediCalc calculators are intended to support qualified healthcare professionals and must not replace professional clinical judgement. Do not enter patient-identifiable information into Saved Progress.

Read our Clinical Disclaimer
Learn More About SNAPPE-II Score
MedicalC Knowledge Hub

SNAPPE-II Score: Clinical Guide

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Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.

Overview

Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.

Clinical Significance

Higher SNAPPE-II scores indicate greater illness severity and mortality risk.

When to Use

  • Use as structured clinical decision support when the required data are available and reliable.

How It Is Calculated

  • The displayed variables are combined using the published equation, decision rule or weighted point system.

Interpretation

  • Higher SNAPPE-II scores indicate greater illness severity and mortality risk.

Worked Example

Enter verified patient data in the displayed units; MedicalC applies the published model.

Limitations

  • Risk and classification tools can be misapplied outside their validated population.
  • Missing, estimated or non-contemporaneous data may materially change the result.

Clinical Pearls

  • Document the inputs, units, date and clinical setting with the result.
  • Use serial scores only when the same instrument and measurement method are used consistently.

Common Mistakes

  • Using the tool without confirming entry criteria.
  • Using approximate or incorrectly converted values.
  • Treating a prognostic score as a standalone treatment decision.

Frequently Asked Questions

What does this tool calculate?

Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.

Can this result be used alone?

No. Interpret it with the full clinical assessment, applicable entry criteria and current guidance.

References

  1. Richardson DK et al. J Pediatr. 2001;138:92-100. — Primary or supporting reference for the implemented model.

Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026

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Reviewed by: MedicalC Clinical Editorial Team Last reviewed: July 2026

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Clinical Disclaimer

MedicalC calculators and clinical tools are intended to support healthcare professionals. They do not replace clinical judgement, individual patient assessment, local guidance or specialist advice.

Results should always be interpreted in the context of the patient’s history, examination, investigations, current clinical condition and applicable professional guidance.

Reviewed by: MedicalC Clinical Editorial Team Last reviewed: July 2026
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