Normal patterns of change for TSH, total T4, and total T3 are depicted for the fetus (beginning at 12 weeks gestation) and continuing for the first 4 weeks of life in the newborn. NOTE: To convert T3 in ng/dL to nmol/L, multiply by 0.01536. To convert T4 in mcg/dL to nmol/L, multiply by 12.87.
Thorpe-Beeston JG, Nicolaides KH, Felton CB, et al. Maturation of the secretion of thyroid hormone and thyroid-stimulating hormone in the fetus. N Engl J Med 1991; 324:532.
Fisher DA. Thyroid physiology in the perinatal period and during childhood. In: Werner's and Ingbar's The Thyroid, Braverman LE, Utiger RD (Eds), Lippincott-Raven, Philadelphia, 1996. p.974.
Williams FL, Simpson J, Delahunty C, et al. Developmental trends in cord and postpartum serum thyroid hormones in preterm infants. J Clin Endocrinol Metab 2004; 89:5314.
Graphic 68673 Version 4.0
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