PT -期刊文章盟Ergenekon Pinar AU -ag, Emine AU - Bas İkizoglu, Nilay AU - Yilmaz Yegit, Cansu AU - Gokdemir, Yasemin AU - Erdem Eralp, Ela AU - Karadag, Bulent TI - Characteristics of cystic fibrosis patients diagnosed after false negative cystic fibrosis newborn screening results AID - 10.1183/13993003.congress-2019.PA4523 DP - 2019 Sep 28 TA - European Respiratory Journal PG - PA4523 VI - 54 IP - suppl 63 4099 - //www.qdcxjkg.com/content/54/suppl_63/PA4523.short 4100 - //www.qdcxjkg.com/content/54/suppl_63/PA4523.full SO - Eur Respir J2019 Sep 28; 54 AB - Introduction and Aim: Since January 1, 2015, newborn screening program has been implemented in our country. The aim of this study is to report the clinical and genotype characteristics of patients who were diagnosed as CF after false negative CFNBS results since January 2015.Material and Methods: 1. The IRT value is greater than 90 ng/ml and 2. IRT value greater than 70 were considered suspicious and referred to a sweat test. The sweat test value above 60 mmol/L was considered positive.Results: 63 patients were diagnosed as CF in our clinic between 2015-2018. While 84.2% (n = 53) of the patients were diagnosed by positive CFNBS result, 15.8% of the patients (n = 10) had false negative results of IRT values. Of the 10 patients included in the study, 50% were girls, with a mean age of 30.7 ± 8.8 months (12-39 months); The mean age of diagnosis was 152 ± 147 days (28-480 days). Genetic mutation was detected in all patients. The first IRT level was above 90 µg/l in 40% (n = 4) of the patients. 40% of the patients had pancreatic insufficiency and Pseudobartter was detected in 70% of patients. Pseudomonas aeroginosa growth in sputum culture was detected in 60% of patients whereas MRSA growth was 10%. 30% of the patients had anemia.Conclusion: Regardless of the results of the newborn screening tests, patients with symptoms supporting CF should be further evaluated. For the patients with intermediate sweat test results, genetic analysis should be performed for CF. As seen in our study, it should be kept in mind that IRT negativity may also occur in mutations that cause severe CF.FootnotesCite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA4523.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).