Preface, C Beckers. Thyroid hormone synthesis and circulating thyroid hormones, C Beckers. Assay of thyroxine-binding globulin (TBG) and free thyroid hormones, Ph. de Nayer. TSH in thyroid disease: methodological problems and clinical interest, F Berthezene & R Mornex. Serum thyroglobulin and thyroglobulin antibodies in thyroid disorders. Methodological and clinical results, U Feldt-Rasmussen. Quality control in the evaluation of thyroid function tests, P G Malan. Thyroid exploration by imaging techniques including fluorescent scanning, P Fragau. Strategy in thyroid evaluation, E P Krenning & G Henneman. Long term follow-up studies in thyrotoxic patients treated with antithyroid drugs, S Nagataki. Radioactive iodine (131I) in the treatment of hyperthyroidism, D V Becker. Carcinogenic and genetic risks of ionizing radiation with special reference to radioiodines, L E Holm. Thyroid cancer, M Tubiana.