title: [Iodine intake during pregnancy: effects on thyroid function in mother and child].
abstract: BACKGROUND
  Recent studies in Spain have shown an inadequate iodine intake in a significant proportion of pregnant women. Pregnancy increases thyroid hormone requirements, and adequate iodine intake is therefore needed.
  
  
  METHODS
  One hundred and forty-seven women in their third trimester (week 37) of pregnancy provided a blood sample and a 24-hour urine sample to test serum and urine iodine levels and completed a food frequency questionnaire to assess iodine intake during pregnancy. Serum TSH levels were measured in the babies born to the 140 mothers in the postpartum group.
  
  
  RESULTS
  Only 10.9% of pregnant women consumed more than 250 μg iodine daily, and 24.4% of them consumed less than 100 μg daily. Mean free T4 levels were 9.37 pmol/L, and 74 women (54.41%) had levels below the hypothyroxinemia threshold. TSH levels were normal in 135 newborns (96.4%), while 5 (3.6%) had levels higher than 5 μU/mL.
authors.affiliation: Área de Gestión Clínica de Pediatría, Hospital Universitario Central de Asturias, Oviedo, Asturias, España. msr1070@hotmail.com
authors.forename: Marta
authors.initials: M
authors.lastname: Suárez Rodríguez
authors.forename: Cristina
authors.initials: C
authors.lastname: Azcona San Julián
authors.forename: Valentín
authors.initials: V
authors.lastname: Alzina de Aguilar
mesh_terms: D003409:Congenital Hypothyroidism / Q000453:epidemiology / Q000209:etiology* / Q000503:physiopathology; D004032:Diet; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D007037:Hypothyroidism / Q000453:epidemiology / Q000209:etiology* / Q000503:physiopathology; D007231:Infant, Newborn; D007455:Iodine / Q000097:blood / Q000172:deficiency / Q000502:physiology* / Q000652:urine; D015997:Neonatal Screening; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology / Q000209:etiology* / Q000503:physiopathology; D011263:Pregnancy Trimester, Third / Q000378:metabolism*; D017673:Sodium Chloride, Dietary; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires; D013960:Thyroid Function Tests; D013961:Thyroid Gland / Q000196:embryology / Q000502:physiology*; D013972:Thyrotropin / Q000097:blood*; D013974:Thyroxine / Q000097:blood* / Q000172:deficiency
chemical_list: D017673:Sodium Chloride, Dietary; C034024:iodized salt; D013972:Thyrotropin; D007455:Iodine; D013974:Thyroxine
keywords: Embarazo; Función tiroidea; Ingesta de yodo; Iodine intake; Pregnancy; Thyroid function