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Updated: May 5, 2026

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Interleukin-6 in COVID-19 Severity Stratification.

Fernando Pereira da Silva1,2, Maria Filomena Luís1,2, Filipa Jesus1

  • 1Department of Pulmonology, Unidade Local de Saúde da Guarda, Avenida Rainha Dona Amélia 19, 6300-749, Guarda, Portugal.

Tanaffos
|August 23, 2024
PubMed
Summary
This summary is machine-generated.

Interleukin-6 (IL-6) levels at emergency department admission can predict COVID-19 severity. Elevated IL-6 indicates a higher likelihood of hospitalization and longer stays, aiding early disease stratification.

Keywords:
COVID-19Interleukin-6SARS-CoV-2

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • The global rise in COVID-19 cases necessitated early identification of severe disease forms.
  • Interleukin-6 (IL-6) is a key pro-inflammatory mediator involved in acute phase responses.
  • Assessing IL-6's role in early severity stratification of SARS-CoV-2 infection is crucial.

Purpose of the Study:

  • To evaluate the utility of serum Interleukin-6 (IL-6) levels for early severity stratification in SARS-CoV-2 infected patients.
  • To determine if IL-6 levels can predict hospitalization and intensive care unit (ICU) admission.
  • To establish cut-off values for IL-6 to guide clinical decisions.

Main Methods:

  • Prospective study involving 117 SARS-CoV-2 patients admitted to the emergency department.
  • Serum IL-6 levels were measured upon admission and compared between patients with and without hospitalization criteria.
  • Statistical analyses included Mann-Whitney test, Pearson's chi-square, ROC curve analysis, and Spearman correlation.

Main Results:

  • IL-6 demonstrated excellent discrimination for hospitalization (AUC=0.888) and ICU admission (AUC=0.897).
  • Identified cut-off values: 12.4 pg/mL for hospitalization and 42.95 pg/mL for ICU admission.
  • A positive correlation was found between IL-6 levels and length of hospital stay (r=0.380, p=0.020).

Conclusions:

  • Serum IL-6 levels at admission are a valuable independent predictor of hospitalization probability and duration in COVID-19 patients.
  • Early IL-6 measurement aids in the early severity stratification of SARS-CoV-2 infection.
  • Findings support the use of IL-6 as a biomarker for managing COVID-19 severity.