RT Journal Article T1 Iron deficiency is associated with Hypothyroxinemia and Hypotriiodothyroninemia in the Spanish general adult population: Di@bet.es study. A1 Maldonado-Araque, Cristina A1 Valdés, Sergio A1 Lago-Sampedro, Ana A1 Lillo-Muñoz, Juan Antonio A1 Garcia-Fuentes, Eduardo A1 Perez-Valero, Vidal A1 Gutierrez-Repiso, Carolina A1 Goday, Albert A1 Urrutia, Ines A1 Peláez, Laura A1 Calle-Pascual, Alfonso A1 Castaño, Luis A1 Castell, Contxa A1 Delgado, Elias A1 Menendez, Edelmiro A1 Franch-Nadal, Josep A1 Gaztambide, Sonia A1 Girbés, Joan A1 Ortega, Emilio A1 Vendrell, Joan A1 Chacón, Matilde R A1 Chaves, Felipe J A1 Soriguer, Federico A1 Rojo-Martínez, Gemma AB Previous studies have suggested that iron deficiency (ID) may impair thyroid hormone metabolism, however replication in wide samples of the general adult population has not been performed. We studied 3846 individuals free of thyroid disease, participants in a national, cross sectional, population based study representative of the Spanish adult population. Thyroid stimulating hormone (TSH), free thyroxin (FT4) and free triiodothyronine (FT3) were analyzed by electrochemiluminescence (E170, Roche Diagnostics). Serum ferritin was analyzed by immunochemiluminescence (Architect I2000, Abbott Laboratories). As ferritin levels decreased (>100, 30-100, 15-30, 100, 30-100, 15-30, YR 2018 FD 2018-04-26 LK http://hdl.handle.net/10668/12403 UL http://hdl.handle.net/10668/12403 LA en DS RISalud RD Apr 9, 2025