Reference limits of serum TSH and free T4 are significantly influenced by race and age in an urban outpatient medical practice.

@article{Boucai2009ReferenceLO,
  title={Reference limits of serum TSH and free T4 are significantly influenced by race and age in an urban outpatient medical practice.},
  author={Laura Boucai and Martin I. Surks},
  journal={Clinical endocrinology},
  year={2009},
  volume={70 5},
  pages={788-93}
}
OBJECTIVE The suitability of TSH reference limits derived from national databases to outpatient practices has not been established. We aimed to determine whether race and age influence the distribution of TSH and free T4 (fT4). DESIGN A cross-sectional study of an urban outpatient medical practice. PARTICIPANTS Patients (n = 22,116) without clinical evidence of thyroid disease or use of thyroid-specific medications. MEASUREMENTS Comparison of TSH and fT4 distributions in specific racial… CONTINUE READING
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Genetic and environmental influences on thyroid hormone variation in Mexican Americans

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