Serum Triiodothyronine Concentrations in Infancy, Childhood, Adolescence and Pediatric Thyroid Disorders*
- 1 August 1973
- journal article
- other
- Published by The Endocrine Society in Journal of Clinical Endocrinology & Metabolism
- Vol. 37 (2) , 235-237
- https://doi.org/10.1210/jcem-37-2-235
Abstract
Measurements of serum total triiodothyronine (T3) concentrations were performed in infants, children, and in adolescent subjects from 3 days to 18 years of age, and in pediatric patients with hypothyroidism and hyperthyroidism. Mean serum T3 concentrations were 140 ± 16.2 ng/100 ml (mean ± 1 se of the mean) in 3-day-old infants and 124 ± 8.3 ng/100 ml in 1–2-yr-old infants. Mean T3 levels in children were 138 ± 2.6 ng/100 ml at ages 3–4 yr, 142 ± 4.7 ng/100 ml at 5–7 yr, and 132 ± 4.4 ng/100 ml at 8–10 yr. In adolescence, mean serum T3 concentrations were 129 ± 4.6 ng/100 ml at 11–13 yr and 134 db 5.9 ng/100 ml at 14–18 yr. No significant differences in serum T3 concentrations were found with puberty, and male and female children and adolescents had similar T3 levels. Patients with hyperthyroidism had serum T3 concentrations from 240–1200 ng/100 ml while hypothyroid subjects had serum T3 concentrations from 66–82 ng/100 ml.Keywords
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