title: Biochemical investigation of foetal and neonatal thyroid function using the ACS-180SE analyser: clinical application.
abstract: Despite sonographic detection of foetal goitre, uncertainty persists in the initial diagnosis of thyrotoxicosis and hypothyroidism. The aim of this study was to establish foetal and neonatal iodothyronine and thyrotrophin reference values for the ACS-180SE analyser. From 22 to 36 weeks of gestation, median foetal serum free thyroxine (FT4) levels increased from 6.0 pmol/L to 143 pmol/L, while free tri-iodothyronine (FT3) levels increased from 0.7 pmol/L to 1.9 pmol/L and mean thyrotrophin (TSH) levels remained stable (10.2 +/- 3.8mU/L; n = 33). At birth, concentrations were independent of gender and gestational age. Among the 10 cases of sonographically detected foetal goitre, serum TSH and FT4 were measured in five, showing hypothyroidism (3/5) or hyperthyroidism (2/5). Cord blood TSH levels reflected the efficacy of prenatal therapy. Measurement of foetal FT4 and TSH can be used to confirm foetal thyroid dysfunction, whereas treatment efficacy can be assessed sonographically and confirmed by measurement of TSH assay at birth.
authors.affiliation: Service de Biochimie-Hormonologie, Hĵpital Robert Debré, Paris, France. jean.guibourdenche@rdb.ap-hop-paris.fr
authors.forename: J
authors.initials: J
authors.lastname: Guibourdenche
authors.forename: M
authors.initials: M
authors.lastname: Noël
authors.forename: D
authors.initials: D
authors.lastname: Chevenne
authors.forename: E
authors.initials: E
authors.lastname: Vuillard
authors.forename: J L
authors.initials: JL
authors.lastname: Voluménie
authors.forename: M
authors.initials: M
authors.lastname: Polak
authors.forename: C
authors.initials: C
authors.lastname: Boissinot
authors.forename: D
authors.initials: D
authors.lastname: Porquet
authors.forename: D
authors.initials: D
authors.lastname: Luton
mesh_terms: D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D005333:Fetus / Q000098:blood supply / Q000378:metabolism*; D005865:Gestational Age; D006042:Goiter / Q000097:blood / Q000175:diagnosis / Q000196:embryology / Q000378:metabolism; D006801:Humans; D006980:Hyperthyroidism / Q000097:blood / Q000175:diagnosis / Q000196:embryology / Q000378:metabolism; D007037:Hypothyroidism / Q000097:blood / Q000175:diagnosis / Q000196:embryology / Q000378:metabolism; D007231:Infant, Newborn / Q000097:blood / Q000378:metabolism*; D016014:Linear Models; D008297:Male; D011247:Pregnancy; D012016:Reference Values; D013961:Thyroid Gland / Q000378:metabolism*; D013972:Thyrotropin / Q000097:blood; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood
chemical_list: D014284:Triiodothyronine; D013972:Thyrotropin; D013974:Thyroxine