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Printed on 4/19/2026
For informational purposes only. This is not medical advice.
The Laboratory Risk Indicator for Necrotizing Fasciitis (LRINEC) score uses CRP, WBC, hemoglobin, sodium, creatinine, and glucose to help differentiate necrotizing soft tissue infection from other severe soft tissue infections. It is a risk-support tool for triage urgency and surgical consultation, not a standalone diagnostic test.
Formula: LRINEC = CRP score + WBC score + Hb score + sodium score + creatinine score + glucose score (0-13).
LRINEC was introduced as a lab-based adjunct to help identify potential necrotizing soft tissue infections among severe soft tissue presentations.
LRINEC helps stratify concern for necrotizing soft tissue infection using routine labs. Higher scores increase concern but do not confirm diagnosis, while lower scores do not safely exclude early disease.
Clinical progression, pain severity out of proportion, skin findings, and hemodynamics remain decisive.
Use LRINEC when evaluating severe skin and soft tissue infections where necrotizing fasciitis is a differential diagnosis.
It is most useful as an adjunct to prioritize urgency and prompt surgical consultation.
LRINEC has variable sensitivity across studies and should not be used as a rule-out test. False reassurance from low scores can be dangerous.
Definitive diagnosis remains clinical and surgical; do not delay emergent management in high-suspicion cases.
For related assessments, see qSOFA Score, SOFA Score and SIRS Criteria.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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EmergencyEvaluate SIRS criteria for systemic inflammatory response. Two or more criteria (temperature, HR, RR, WBC) indicates SIRS. Note: Sepsis-3 definitions now prefer qSOFA and SOFA scoring.
EmergencyCalculate the Shock Index (HR/SBP ratio) for rapid hemodynamic assessment. Normal: 0.5–0.7. Score ≥1.0 indicates hemodynamic compromise; ≥1.4 indicates severe shock requiring immediate intervention.