New Injury Severity Score (NISS)
New Injury Severity Score (NISS) - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
Open the New Injury Severity Score (NISS) → Runs in your browser. No signup, no tracking.
What this is
New Injury Severity Score (NISS) is one of 230 deterministic tools in Sophie Well's Clinical Math & Conversions group. New Injury Severity Score (NISS) - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
When to use it
Use this tool when you need a quick, citable reference. Every calculation runs entirely in your browser - no inputs leave your device, no account is required, no AI is involved. The site enforces a strict Content Security Policy and ships no analytics or third-party CDN.
References
Osler T, Baker SP, Long W. A modification of the injury severity score that both improves accuracy and simplifies scoring. J Trauma. 1997;43(6):922-925. Read the source ↗
Worked example: NISS 75: an AIS 6 (unsurvivable by convention) forces the maximal score; three worst AIS 6, 3, 2.
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.