Objective: To detect the concentration of high-sensitivity cardiac troponin T (hs-cTnT) in healthy children aged 0-14 years by electrochemiluminescence immunoassay (ECLIA), so as to explore the differences in different ages and genders. The aim of this study is to establish the reference interval for hs-cTnT in healthy children aged 0-14 years.
Methods: After screening, 3463 healthy children, including 1924 boys and 1539 girls, were selected from 4617 children aged 0-14 years. They were divided into nine groups: one day (umbilical cord blood; 'UCB'), one day (venous blood; 'VB'), 2-28 days, 29 days-<3 months, 3-<6 months, 6 months-<1 year old, 1-< 3 years old, 3-< 6 years old and 6-14 years old. A nonparametric test was used to detect the hs-cTnT concentration. The upper limit of the reference interval is the mean of the 99th percentile after bootstrap sampling.
Results: Hs-cTnT levels conformed to a non-Gaussian distribution. There was no significant difference in the concentration of hs-cTnT between boys and girls in the general data, but there were differences between boys and girls in the 3-<6 years old and 6-14 years old age groups. Except for UCB and 2-28 days, the concentration of hs-cTnT was significantly different in other age groups. The level of hs-cTnT in neonatal serum (2-28 days) was the highest. In other groups, it decreased gradually with age and dropped to the reference range of adults (0-14ng/L) at one-year old. The upper limit of reference interval of hs-cTnT concentration in each group was, respectively, 60.8, 78.8, 96.6, 58.6, 34.2, 16.2, 11.4, 8.0 (7.8 female), and 7.9 (7.3 female) ng/L.
Conclusions: Referring to WS/T 402-2012 establishment of reference intervals for clinical laboratory testing projects and CLSI (Clinical and Laboratory Standards Institute) C28-A3 documents and the joint expert consensus of ESC (European Society of Cardiology) and ACC (American College of Cardiology) in 2007, we established the reference interval of hs-cTnT concentration in children aged 0-14 years in Chongqing Nan'an district of China which can provide certain reference value for clinical diagnosis and treatment of myocarditis and myocardial (micro) injury in children.
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