Narrative review highlights within-person variation in serum thyrotropin concentrations across individuals, suggesting standardizing testing is essential for accurate clinical evaluation.
Serum TSH concentrations vary over time within an individual, which is caused by multiple different internal and external factors. It is important to take the within-person variations in serum TSH concentrations into account when testing a patient in clinical practice, but also in performing clinical research.
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Spoel et al. (2021) studied this question.
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