Circadian and Circannual Rhythms in Thyroid Hormones: Determining the TSH and Free T4 Reference Intervals Based Upon Time of Day, Age, and Sex

Ehrenkranz, Joel; R. Bach, Phillip; L. Snow, Gregory; Schneider, Alison; Lynn Lee, Jo; J. Ilstrup, Sarah; T. Bennett, Sterling; Benvenga, Salvatore

doi:10.1089/thy.2014.0589

Public

Circadian and Circannual Rhythms in Thyroid Hormones: Determining the TSH and Free T4 Reference Intervals Based Upon Time of Day, Age, and Sex

Published in Thyroid • Jun 10, 2015

Authors:

Joel Ehrenkranz

Phillip R. Bach

Gregory L. Snow

Abstract

BACKGROUND: Establishing the reference interval for thyrotropin (TSH) and free thyroxine (T4) is clinically important because a number of disease states have been linked to alterations in TSH and free T4 concentrations that are within the 95% confidence interval for normal thyroid hormone values. Ag...

Subject

Circadian rhythm

Internal medicine

Endocrinology

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