Narrow intra-individual variation of maternal thyroid function in pregnancy based on a longitudinal study on 132 women
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Narrow intra-individual variation of maternal thyroid function in pregnancy based on a longitudinal study on 132 women. / Boas, M.; Forman, Julie Lyng; Juul, A.; Feldt-Rasmussen, U.; Skakkebaek, N.E.; Hilsted, L.; Chellakooty, M.; Larsen, T.; Larsen, J.F.; Petersen, Jørgen Holm; Main, K.M.
I: European Journal of Endocrinology, Bind 161, Nr. 6, 2009, s. 903-910.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Narrow intra-individual variation of maternal thyroid function in pregnancy based on a longitudinal study on 132 women
AU - Boas, M.
AU - Forman, Julie Lyng
AU - Juul, A.
AU - Feldt-Rasmussen, U.
AU - Skakkebaek, N.E.
AU - Hilsted, L.
AU - Chellakooty, M.
AU - Larsen, T.
AU - Larsen, J.F.
AU - Petersen, Jørgen Holm
AU - Main, K.M.
PY - 2009
Y1 - 2009
N2 - BACKGROUND: Adaptive alterations in maternal physiology cause changes in thyroid hormone levels throughout pregnancy, and precise biochemical evaluation is thus highly dependent on gestation-specific reference intervals and expected intra-individual variation. OBJECTIVE: The aim of the study was the assessment of the intra-individual variation as well as the longitudinal course of thyroid hormones during normal pregnancy and factors that influence the normal reference range for thyroid function. For this purpose, a longitudinal statistical model was applied. DESIGN: In a cohort of 132 pregnant women, serial blood samples were obtained and ultrasound scans were performed throughout pregnancy. METHODS: Serum levels of TSH, free and total thyroxine (T(4)), free and total triiodothyronine (T(3)) as well as autoantibodies against thyroid peroxidase and thyroglobulin were measured in 979 serum samples. RESULTS: Intra-individual variations of thyroid hormone concentrations were smaller than inter-individual variations (individuality index range: 0.38-0.71). Maternal height was positively associated with free T(4) (FT(4)) (b=0.003; P=0.031) and pre-pregnancy body mass index with T(3) and free T(3) (b=0.017; <0.001 and b=0.007; P<0.001). Smoking was positively associated with T(4) and FT(4), but it was modulated by gestational age. Gestation-specific reference intervals for thyroid function variables from autoantibody-negative participants are presented. CONCLUSIONS: In accordance with the data from nonpregnant adults, intra-individual variations of thyroid hormones were smaller than inter-individual variations also during pregnancy. In the evaluation of thyroid function in pregnancy, the individual longitudinal course of thyroid hormones rather than absolute values should be considered. We present a longitudinal model for the prediction of maternal thyroid function tests in pregnant women Udgivelsesdato: 2009/12
AB - BACKGROUND: Adaptive alterations in maternal physiology cause changes in thyroid hormone levels throughout pregnancy, and precise biochemical evaluation is thus highly dependent on gestation-specific reference intervals and expected intra-individual variation. OBJECTIVE: The aim of the study was the assessment of the intra-individual variation as well as the longitudinal course of thyroid hormones during normal pregnancy and factors that influence the normal reference range for thyroid function. For this purpose, a longitudinal statistical model was applied. DESIGN: In a cohort of 132 pregnant women, serial blood samples were obtained and ultrasound scans were performed throughout pregnancy. METHODS: Serum levels of TSH, free and total thyroxine (T(4)), free and total triiodothyronine (T(3)) as well as autoantibodies against thyroid peroxidase and thyroglobulin were measured in 979 serum samples. RESULTS: Intra-individual variations of thyroid hormone concentrations were smaller than inter-individual variations (individuality index range: 0.38-0.71). Maternal height was positively associated with free T(4) (FT(4)) (b=0.003; P=0.031) and pre-pregnancy body mass index with T(3) and free T(3) (b=0.017; <0.001 and b=0.007; P<0.001). Smoking was positively associated with T(4) and FT(4), but it was modulated by gestational age. Gestation-specific reference intervals for thyroid function variables from autoantibody-negative participants are presented. CONCLUSIONS: In accordance with the data from nonpregnant adults, intra-individual variations of thyroid hormones were smaller than inter-individual variations also during pregnancy. In the evaluation of thyroid function in pregnancy, the individual longitudinal course of thyroid hormones rather than absolute values should be considered. We present a longitudinal model for the prediction of maternal thyroid function tests in pregnant women Udgivelsesdato: 2009/12
U2 - 10.1530/EJE-09-0579
DO - 10.1530/EJE-09-0579
M3 - Journal article
C2 - 19773370
VL - 161
SP - 903
EP - 910
JO - European Journal of Endocrinology
JF - European Journal of Endocrinology
SN - 0804-4643
IS - 6
ER -
ID: 19572692