Introduction: We aimed to compare the amniotic fluid interleukin (IL)-6 concentrations measured using the automated electrochemiluminescence immunoassay method and ELISA, and to establish an IL-6 concentration cut-off value for intra-amniotic inflammation (IAI) in preterm prelabor rupture of membranes (PPROM), which can be used in the automated electrochemiluminescence immunoassay method.Materials and methods: A total of 120 women with PPROM were included in this study. Amniotic fluid samples were obtained through transabdominal amniocentesis. IL-6 concentrations were assessed using both the automated electrochemiluminescence immunoassay method and ELISA, the current gold standard. IAI was defined as an amniotic fluid IL-6 concentration of ≥2600 pg/mL measured using ELISA.Results: A correlation between both assays was found (Spearman's rho = 0.97; p < .0001). Based on the receiver-operating characteristic curve for the identification of IAI (area under the curve = 0.99), a cut-off value of ≥3000 pg/mL was selected for the automated electrochemiluminescence immunoassay method with a sensitivity of 88%, specificity of 99%, positive predictive value of 97%, negative predictive value of 96%, and likelihood ratio of 76.Conclusions: For amniotic fluid IL-6 concentrations assessed using the automated electrochemiluminescence immunoassay method, a cut-off value of 3000 pg/mL was indicated for diagnosing IAI in women with PPROM.

BC Natal Barcelona Center for Maternal Fetal and Neonatal Medicine Hospital Clinic and Hospital Sant Joan de Déu University of Barcelona Barcelona Spain

Biomedical Research Center University Hospital Hradec Kralove Hradec Kralove Czech Republic

Centre for Biomedical Research on Rare Diseases Barcelona Spain

Department of Clinical Immunology and Allergy University Hospital Hradec Kralove Hradec Kralove Czech Republic

Department of Genetics and Bioinformatics Division of Health Data and Digitalisation Norwegian Institute of Public Health Oslo Norway

Department of Obstetrics and Gynecology Gothenburg University Gothenburg Sweden

Department of Obstetrics and Gynecology University Hospital Hradec Kralove Hradec Kralove Czech Republic

Department of Obstetrics and Gynecology University Hospital Olomouc Olomouc Czech Republic

Institute of Clinical Biochemistry and Diagnostics University Hospital Hradec Kralove Hradec Kralove Czech Republic

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