Declining Diagnostic Accuracy of the Laboratory Risk Indicator for Necrotizing Fasciitis (LRINEC) Score in Necrotizing Fasciitis: A Case Report With Contemporary Evidence Review

Necrotizing fasciitis is a rapidly advancing soft-tissue infection with high morbidity and mortality, and markedly worse prognosis when complicated by delayed diagnosis and intervention. Distinguishing necrotizing fasciitis from less severe soft-tissue infections remains a significant clinical challenge, prompting the development of the Laboratory Risk Indicator for Necrotizing Fasciitis (LRINEC) score to aid early recognition. Early enthusiasm for the score led to widespread clinical use; however, subsequent experience has raised concerns about its utility as a sensitive rule-out tool. We present a case of surgically confirmed necrotizing fasciitis in which the LRINEC score failed to appropriately categorize the condition as high risk at presentation, prompting a focused investigation of evolving LRINEC literature. This case and accompanying review highlight the limitations of the LRINEC score as an isolated rule-out diagnostic instrument and support its more adjunctive role to clinical judgement, physical examination, imaging, and early surgical consultation. A high index of suspicion combined with conscientious implementation of comprehensive and inclusive diagnostic utilities can avoid delays in diagnosis and promote improved outcomes while modified and novel diagnostic applications are investigated.