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Stability of thyroid function in older adults : the Birmingham Elderly Thyroid Study
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Roberts, Lesley, McCahon, Deborah, Johnson, Oliver, Haque, M. Sayeed, Parle, James and Hobbs, F. D. Richard (2018) Stability of thyroid function in older adults : the Birmingham Elderly Thyroid Study. British Journal of General Practice, 68 (675). e718-e726. doi:10.3399/bjgp18X698861 ISSN 0960-1643.
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Official URL: https://doi.org/10.3399/bjgp18X698861
Abstract
Background
Thyroid function tests (TFTs) are among the most requested tests internationally. However, testing practice is inconsistent, and potentially suboptimal and overly costly. The natural history of thyroid function remains poorly understood.
Aim
To establish the stability of thyroid function over time, and identify predictors of development of overt thyroid dysfunction.
Design and setting
Longitudinal follow-up in 19 general practices in the UK.
Method
A total of 2936 participants from the Birmingham Elderly Thyroid Study (BETS 1) with a baseline TFT result indicating euthyroid or subclinical state were re-tested after approximately 5 years. Change in thyroid-stimulating hormone (TSH), free thyroxine (FT4), and thyroid status between baseline and follow-up was determined. Predictors of progression to overt dysfunction were modelled.
Results
Participants contributed 12 919 person-years; 17 cases of overt thyroid dysfunction were identified, 13 having been classified at baseline as euthyroid and four as having subclinical thyroid dysfunction. Individuals with subclinical results at baseline were 10- and 16-fold more likely to develop overt hypothyroidism and hyperthyroidism, respectively, compared with euthyroid individuals. TSH and FT4 demonstrated significant stability over time, with 61% of participants having a repeat TSH concentration within 0.5 mIU/L of their original result. Predictors of overt hypothyroidism included new treatment with amiodarone (odds ratio [OR] 92.1), a new diagnosis of atrial fibrillation (OR 7.4), or renal disease (OR 4.8).
Conclusion
High stability of thyroid function demonstrated over the 5-year interval period should discourage repeat testing, especially when a euthyroid result is in the recent clinical record. Reduced repeat TFTs in older individuals is possible without conferring risk, and could result in significant cost savings.
Item Type: | Journal Article | ||||||||
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Subjects: | R Medicine > RC Internal medicine | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences > Mental Health and Wellbeing Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Thyroid gland function tests, Older people -- Health aspects | ||||||||
Journal or Publication Title: | British Journal of General Practice | ||||||||
Publisher: | Royal College of General Practitioners | ||||||||
ISSN: | 0960-1643 | ||||||||
Official Date: | October 2018 | ||||||||
Dates: |
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Volume: | 68 | ||||||||
Number: | 675 | ||||||||
Page Range: | e718-e726 | ||||||||
DOI: | 10.3399/bjgp18X698861 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 20 August 2018 | ||||||||
Date of first compliant Open Access: | 27 September 2019 | ||||||||
RIOXX Funder/Project Grant: |
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