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Serum thyroxine levels in patients receiving L-thyroxine suppression or replacement therapy
Canadian Medical Association Journal
|August 18, 1973
Summary
Clinical evaluation is key for assessing euthyroid status in patients on L-thyroxine therapy. Serum thyroxine (T4) and protein-bound iodine (PBI) levels show wide variations, making them secondary diagnostic tools.
Area of Science:
- Endocrinology
- Pharmacology
Background:
- L-thyroxine is a common treatment for thyroid disorders.
- Monitoring therapeutic efficacy is crucial for patient management.
Purpose of the Study:
- To evaluate the utility of serum thyroxine (T4) and protein-bound iodine (PBI) levels in assessing euthyroid status in patients on L-thyroxine therapy.
Main Methods:
- Serum T4 and PBI levels were measured in 140 adult patients receiving L-thyroxine (0.2 or 0.3 mg daily) for at least six months.
- Patients were clinically assessed as euthyroid at the time of blood collection.
Main Results:
- Mean PBI was 8.3 mug./100 ml (range: 3.5-13.2).
- Mean T4 was 10.8 mug./100 ml (range: 3.1-17.0).
- Significant variability was observed in both PBI and T4 levels.
Conclusions:
- Clinical assessment should be the primary method for determining euthyroid status in patients on L-thyroxine.
- Serum T4 and PBI levels serve as secondary indicators due to their wide range of values in treated patients.