Thyroid hormone levels in late preterm, early term and term infants: a study with healthy neonates revealing reference values and factors affecting thyroid hormones
-
Ozge Nur Aktas
,
Elif Soysal
Abstract
Background:
Thyroid function tests in neonates have been challenging to interpret because their levels are affected by several neonatal and delivery-related factors. The aim of the study was to evaluate reference values of thyroxine (T4) and thyrotropin (TSH) levels in different gestational age groups and to demonstrate the affect of perinatal factors on thyroid hormones.
Methods:
Medical records of 7616 neonates whose gestational age ranges between 34 and 42 weeks were analyzed retrospectively. Gender, mode of delivery, gestational age, postnatal age and birth weight were noted together with TSH and T4 levels.
Results:
Gestational age (r=0.14, p<0.001) and birth weight (r=0.12, p<0.001) had positive correlation with T4 levels, whereas they had no effect on TSH levels. Males had higher TSH and lower T4 levels (p=0.001 for both) compared with females. T4 levels of babies born via vaginal delivery were lower than the ones born via cesarean section (p=0.01). Multivariable analysis yielded gestational age as the only factor affecting T4 levels (p<0.001). T4 and TSH levels based on 2.5–97.5 percentile cutoffs according to gestational age were presented.
Conclusions:
The thyroid hormone ranges given in this study can help pediatricians to interpret the thyroid hormone results with ease.
Acknowledgments
We would like to thank Aslıhan Asılsoy for her invaluable support in this study.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Mini Review
- Severe complications after initial management of hyperglycemic hyperosmolar syndrome and diabetic ketoacidosis with a standard diabetic ketoacidosis protocol
- Original Articles
- Markers influencing the presence of partial clinical remission in patients with newly diagnosed type 1 diabetes
- Oral health status of children with type 1 diabetes: a comparative study
- The relationship between non-alcoholic fatty liver disease and small intestinal bacterial overgrowth among overweight and obese children and adolescents
- High attainment of optimal nutritional and growth status observed among Greek pediatric cystic fibrosis patients: results from the GreeCF study
- Secular trends in height, weight and body mass index of primary school children in Turkey between 1993 and 2016
- Effects of 1-year growth hormone replacement therapy on thyroid volume and function of the children and adolescents with idiopathic growth hormone deficiency
- Thyroid hormone levels in late preterm, early term and term infants: a study with healthy neonates revealing reference values and factors affecting thyroid hormones
- Makorin ring finger 3 gene analysis in Koreans with familial precocious puberty
- Genetic analysis of fructose-1,6-bisphosphatase (FBPase) deficiency in nine consanguineous Pakistani families
- Reassessing the significance of the PAH c.158G>A (p.Arg53His) variant in patients with hyperphenylalaninemia
- Case Reports
- Sirolimus precipitating diabetes mellitus in a patient with congenital hyperinsulinaemic hypoglycaemia due to autosomal dominant ABCC8 mutation
- Persistent de Quervain tenosynovitis induced by somatotropin treatment
- Early-onset severe obesity due to complete deletion of the leptin gene in a boy
- Congenital cataract with LSS gene mutations: a new case report
Artikel in diesem Heft
- Frontmatter
- Mini Review
- Severe complications after initial management of hyperglycemic hyperosmolar syndrome and diabetic ketoacidosis with a standard diabetic ketoacidosis protocol
- Original Articles
- Markers influencing the presence of partial clinical remission in patients with newly diagnosed type 1 diabetes
- Oral health status of children with type 1 diabetes: a comparative study
- The relationship between non-alcoholic fatty liver disease and small intestinal bacterial overgrowth among overweight and obese children and adolescents
- High attainment of optimal nutritional and growth status observed among Greek pediatric cystic fibrosis patients: results from the GreeCF study
- Secular trends in height, weight and body mass index of primary school children in Turkey between 1993 and 2016
- Effects of 1-year growth hormone replacement therapy on thyroid volume and function of the children and adolescents with idiopathic growth hormone deficiency
- Thyroid hormone levels in late preterm, early term and term infants: a study with healthy neonates revealing reference values and factors affecting thyroid hormones
- Makorin ring finger 3 gene analysis in Koreans with familial precocious puberty
- Genetic analysis of fructose-1,6-bisphosphatase (FBPase) deficiency in nine consanguineous Pakistani families
- Reassessing the significance of the PAH c.158G>A (p.Arg53His) variant in patients with hyperphenylalaninemia
- Case Reports
- Sirolimus precipitating diabetes mellitus in a patient with congenital hyperinsulinaemic hypoglycaemia due to autosomal dominant ABCC8 mutation
- Persistent de Quervain tenosynovitis induced by somatotropin treatment
- Early-onset severe obesity due to complete deletion of the leptin gene in a boy
- Congenital cataract with LSS gene mutations: a new case report
