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Diagnostic scoring system for necrotising fasciitis

Authoring team

Laboratory Risk Indicator for Necrotizing Fasciitis scoring system (LRNEC) is considered to be the most accurate diagnostic scoring system currently in use (1). It is used to differentiate NF from other type of soft tissue infection based on the laboratory investigations

  • a score of
    • 5 points-indicates a low risk (<50% probability) of NF
    • 6-7 points-indicate and intermediate risk (50%-75% probability)
    • 8 points or more - indicate a high risk (>75% probability) (2)
  • in a Singaporean population, a score of ≥6 was 93% sensitive and 92% specific for necrotising fasciitis while in UK it was only 74% sensitive and 81% specific.

variable

score

C reactive protein (mg/L)

 

>150

4

white blood cell count (per mm3)

 

<15

0

15-25

1

>25

 

haemoglobin (g/dL)

 

>13.5

0

11-13.5

1

<11

2

sodium (mmol/L)

 

<135

2

creatinine

 

>141

2

glucose (mmol/L)

 

>10

1

Reference:

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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