Conversely, a decreasing trend of FT4 (and FT3) concentration is more consistently reported.
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Trimester-specific reference intervals for thyroid function parameters in pregnant Caucasian women using Roche platforms: a prospective study.
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The sentences
The results reported in available longitudinal studies, summarized in Table 4 , demonstrated different trends in TSH concentration: according to some studies, TSH is stable throughout pregnancy, according to others an increasing trend is recognizable.