Ferritin levels in children with juvenile idiopathic arthritis of systemic onset and children with other causes of fever of unknown origin: A multicenter study of diagnostic tests

Ruth Eraso, Claudia Patricia Benítez , Sergio Jaramillo , Jorge Acosta-Reyes , Beatriz Helena Aristizábal , Augusto Quevedo , .

Keywords: systemic juvenile idiopathic arthritis/diagnosis, ferritins, sensitivity and specificity, likelihood ratio

Abstract

Introduction: There are no sensitive or specific tests available to diagnose systemic juvenile idiopathic arthritis (sJIA).
Objective: To assess the utility as diagnostic tests of total ferritin (TF) levels greater than 5 times the normal value (TF>5N) and the decreased percentage (less than or equal to 20% of TF) of glycosylated ferritin (GF≤20%) for the diagnosis of sJIA in patients with fever of unknown origin evaluated by pediatric rheumatology.
Materials and methods: We conducted an observational, cross-sectional study of diagnostic tests in children under 16 years of age hospitalized between 2010 and 2014. The reference diagnostic standard was the fulfillment of the classification criteria or confirmed diagnosis at follow-up. We determined the measures of utility of the tests.
Results: We included 40 patients with fever of unknown origin, 11 with sJIA, and 29 with other diagnoses. The median TF was higher in sAIJ (3992 ng/ml) versus other causes of fever of unknown origin (155 ng/ml) (p=0.0027), as well as TF>5N (90.91% versus 51.72%) (p=0.023). The percentage of GF≤20% was higher in patients with other causes of fever of unknown origin (96.5%) compared to sJIA (81.8%) (p=0.178). TF>5N had a sensitivity of 91%, specificity of 48%, positive likelihood ratio (LR) of 1.76, and negative LR of 0.19 demonstrating greater utility for the diagnosis of sJIA than the combination of FT> 5N with GFR <20%, with a sensitivity of 81.8%, specificity of 48.3%, positive LR of 1.58, and negative LR of 0.38.
Conclusion: In patients with FUO evaluated by pediatric rheumatology, TF> 5N proved useful as a screening test for the diagnosis of sJIA.

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  • Ruth Eraso Facultad de Medicina, Departamento de Pediatría, Universidad de Antioquia, Medellín, Colombia; Departamento de Pediatría, Hospital Pablo Tobón Uribe, Medellín, Colombia https://orcid.org/0000-0003-2135-2382
  • Claudia Patricia Benítez Unidad de Investigación Genética Molecular, UNIGEM-Colombia, Medellín, Colombia https://orcid.org/0000-0002-7846-8602
  • Sergio Jaramillo Departamento de Laboratorio, Hospital Pablo Tobón Uribe, Medellín, Colombia
  • Jorge Acosta-Reyes División Ciencias de la Salud, Departamento de Salud Pública, Universidad del Norte, Barranquilla, Colombia https://orcid.org/0000-0003-4303-3243
  • Beatriz Helena Aristizábal Unidad de Investigación Genética Molecular, UNIGEM-Colombia, Medellín, Colombia; Departamento de Laboratorio, Hospital Pablo Tobón Uribe, Medellín, Colombia https://orcid.org/0000-0002-7846-8602
  • Augusto Quevedo Facultad de Medicina, Departamento de Pediatría, Universidad de Antioquia, Medellín, Colombia; Departamento de Pediatría, Hospital Universitario San Vicente Fundación, Medellín, Colombia https://orcid.org/0000-0002-0504-8236

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How to Cite
1.
Eraso R, Benítez CP, Jaramillo S, Acosta-Reyes J, Aristizábal BH, Quevedo A. Ferritin levels in children with juvenile idiopathic arthritis of systemic onset and children with other causes of fever of unknown origin: A multicenter study of diagnostic tests. Biomed. [Internet]. 2021 Dec. 15 [cited 2025 Apr. 4];41(4):787-802. Available from: https://revistabiomedicaorg.biteca.online/index.php/biomedica/article/view/5849

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Published
2021-12-15
Section
Original articles

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