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Gestation specific reference intervals for thyroid function tests in pregnancy.

Süleyman Akarsu, Filiz Akbiyik, Eda Karaismailoglu

    Clinical Chemistry and Laboratory Medicine
    |January 12, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Establishing pregnancy-specific thyroid function reference intervals is crucial for accurate diagnosis. This study determined gestation-specific reference intervals for thyroid-stimulating hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) in pregnant Turkish women.

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    Area of Science:

    • Endocrinology
    • Reproductive Medicine
    • Clinical Chemistry

    Background:

    • Thyroid dysfunction during pregnancy requires accurate assessment using pregnancy-specific reference intervals.
    • Non-pregnant reference intervals can lead to misclassification of thyroid function in pregnant individuals.
    • International guidelines advocate for institution-specific, gestation-specific reference intervals for thyroid hormones.

    Purpose of the Study:

    • To establish gestation-specific reference intervals (GRIs) for thyroid function tests in pregnant Turkish women.
    • To compare these established GRIs with reference intervals from age-matched non-pregnant women.
    • To provide accurate diagnostic tools for thyroid dysfunction in pregnancy.

    Main Methods:

    • Serum samples were collected from 220 non-pregnant women and 2460 pregnant women across three trimesters.
    • Thyroid-stimulating hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) levels were measured.
    • Gestation-specific reference intervals (GRIs) were calculated for each trimester.

    Main Results:

    • Gestation-specific reference intervals (GRIs) for TSH, FT4, and FT3 were determined for the first, second, and third trimesters.
    • TSH levels demonstrated an increasing trend from the first to the third trimester.
    • FT4 and FT3 levels remained relatively uniform throughout gestation.
    • Established GRIs differed significantly from non-pregnant reference intervals.

    Conclusions:

    • Gestation-specific reference intervals for TSH, FT4, and FT3 are essential for accurate thyroid function assessment in pregnant women.
    • The established GRIs can aid in the diagnosis and management of thyroid dysfunction during pregnancy.
    • Appropriate management based on accurate intervals can prevent maternal and fetal complications.