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Adding interpretative comments to results of thyroid function tests from patients on thyroxine replacement does not

Amy Mallorie¹, Tim James¹, Sureshni deFonseka²

¹Department of Clinical Biochemistry, Oxford University Hospitals NHS Foundation Trust, Oxford, UK.

Journal of Clinical Pathology

|October 10, 2025

Summary

Adding clinical comments to thyroid function test reports does not significantly impact thyroid-stimulating hormone (TSH) levels or testing intervals in patients with hypothyroidism. This suggests clinical comments may not be essential for managing thyroxine replacement therapy.

Keywords:

BIOCHEMISTRY Laboratories, Clinical Thyroid Diseases

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Area of Science:

Clinical Chemistry
Endocrinology
Health Services Research

Background:

Hypothyroidism management relies on thyroid function tests, primarily thyroid-stimulating hormone (TSH).
Interpretative comments on lab reports aim to aid clinical decision-making.
The impact of these comments on patient management in primary care is not well-established.

Purpose of the Study:

To evaluate the effect of adding clinical comments to thyroid function test reports.
To assess the impact on TSH levels and repeat testing intervals in hypothyroid patients on thyroxine replacement.

Main Methods:

Retrospective comparison of thyroid function tests in two NHS Trusts with differing comment policies (Buckinghamshire Health Trust vs. Oxford University Hospitals).
Analysis of TSH results and testing intervals for primary care patients treated for hypothyroidism between January 2016 and August 2023.
Outcome measures included the percentage of TSH within the reference interval and adherence to National Institute for Health and Care Excellence (NICE) guidance for testing frequency.

Main Results:

No significant difference in the proportion of TSH results within the reference interval between the two Trusts (83.4% vs. 83.9%).
Similar median TSH concentrations were observed (1.60 mU/L vs. 1.68 mU/L).
While testing intervals differed, both varied from NICE guidance, with statistically significant but clinically questionable differences.

Conclusions:

The addition of interpretative comments to thyroid function test reports does not demonstrably alter TSH concentration distributions or testing intervals in primary care patients on thyroxine.
The findings suggest that clinical comments may have a limited impact on the management of hypothyroidism in this setting.
Further research could explore patient and clinician perceptions of interpretative comments.