Open Access Study protocol

Nutritional status of iodine in pregnant women in Catalonia (Spain): study on hygiene-dietetic habits and iodine in urine

Gemma Prieto1, Maria Teresa Torres2*, Lidia Francés3, Gemma Falguera4, Lluis Vila5, Josep María Manresa6, Roser Casamitjana7, Juan Ramón Barrada8, Amèlia Acera9, Dolors Guix10, Anna Torrent11, Josep Grau12, Pere Torán6 and the IODEGEST study group

Author Affiliations

1 Gerencia de Atención Primaria, Avenida Portugal 47, 05004 Ávila, Spain

2 Atenció Salut Sexual i Reproductiva (ASSIR) Institut Català de la Salut Terrassa, CAP Antoni Creus i Querol, Carrer Italia 5, Terrassa, 08228 Barcelona, Spain

3 Unidad Docente de Matronas de Cataluña, Escuela de Enfermería, Universitat de Barcelona, Feixa Llarga s/n, 08907 L'Hospitalet de Llobregat, Barcelona, Spain

4 Atenció Salut Sexual i Reproductiva (ASSIR), Institut Català de la Salut Gerència Territorial Catalunya Central i Gerència Territorial Metropolitana Nord-Vallès Oriental- Valllès Occidental, Ctra de Barcelona 473, 1ª planta, 08203 Sabadell, Barcelona, Spain

5 Servicio de Endocrinología y Nutrición, Hospital de Sant Joan Despí 'Moisès Broggi', Carrer Jacint Verdaguer 90, 08970 Sant Joan Despí, Barcelona, Spain

6 Unitat de Suport a la Recerca Metropolitana Nord ICS-IDIAP Jordi Gol, Rambla 227, 08203 Sabadell, Barcelona, Spain

7 Consultor Sènior del servei de Bioquímica i Genètica Molecular, Hospital Clínic, Carrer Villarroel 170, 08036 Barcelona, Spain

8 Facultat de Psicología, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain

9 Atenció Salut Sexual i reproductiva (ASSIR), Institut Català de la Salut Cerdanyola, Ctra. N-150 i C/Tarragona, s/n, 08291 Ripollet, Barcelona, Spain

10 Atenció Salut Sexual i Reproductiva (ASSIR) Institut Català de la Salut Granollers, Moseu 19, 4ª planta, 08400 Granollers, Barcelona, Spain

11 Atenció Salut Sexual i Reproductiva (ASSIR) Institut Català de la Salut Mollet, Av. Rívoli 7, 08100 Mollet, Barcelona, Spain

12 Atenció Salut Sexual i Reproductiva (ASSIR) Institut Català de la Salut Osona, Pl Divina Pastora 6, 08500 Vic, Barcelona, Spain

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BMC Pregnancy and Childbirth 2011, 11:17  doi:10.1186/1471-2393-11-17

Published: 8 March 2011



It is a priority to achieve an adequate nutritional status of iodine during pregnancy since iodine deficiency in this population may have repercussions on the mother during both gestation and post partum as well as on the foetus, the neonate and the child at different ages. According to the WHO, iodine deficiency is the most frequent cause of mental retardation and irrreversible cerebral lesions around the world. However, few studies have been published on the nutritional status of iodine in the pregnant population within the Primary Care setting, a health care level which plays an essential role in the education and control of pregnant women. Therefore, the aim of the present study is: 1.- To know the hygiene-dietetic habits related to the intake of foods rich in iodine and smoking during pregnancy. 2.- To determine the prevalence of iodine deficiency and the factors associated with its appearance during pregnancy.


We will perform a cluster randomised, controlled, multicentre trial. Randomisation unit: Primary Care Team. Study population: 898 pregnant women over the age of 17 years attending consultation to a midwife during the first trimester of pregnancy in the participating primary care centres. Outcome measures: consumption of iodine-rich foods and iodine deficiency. Points of assessment: each trimester of the gestation. Intervention: group education during the first trimester of gestation on healthy hygiene-dietetic habits and the importance of an adequate iodine nutritional status. Statistical analysis: descriptive analysis of all variables will be performed as well as multilevel logistic regression. All analyses will be done carried out on an intention to treat basis and will be fitted for potential confounding factors and variables of clinical importance.


Evidence of generalised iodine deficiency during pregnancy could lead to the promotion of interventions of prevention such as how to improve and intensify health care educational programmes for pregnant women.

Trial Registration NCT01301768