Thyroid Investigations Guide
Normal Regulation of Thyroid Hormones: Thyroid Function tests routinely measure: Hypothyroidism Hyperthyroidism Investigations T4 TSH Hyperthyroidism High Low Hypothyroidism Low High Hypothyroidism secondary to pituitary disease Low Low Radiological Assessment Thyroid USS +/- Fine Needle Aspiration (FNA) Thoracic inlet CT Radioisotope iodine scans