Abstract
Thyroid dysfunction may result in inappropriate hormone secretion, mass effects, or a combination of both problems. Taking a relevant history and performing a thorough examination is the first step to reaching the correct diagnosis. Investigations should be selected according to the clinical findings and may be used to confirm clinical suspicions, to rule out serious pathology, and to establish the severity of the dysfunction. Blood tests are usually the first line, with biochemistry to confirm the functional status of the gland and, if appropriate, testing for autoantibodies to confirm autoimmunity. Ultrasound is the preferred method for detecting intra-thyroid lesions, with a sensitivity of 2 mm for cystic, and 3 mm for solid lesions. CT and MRI are of limited utility outside of tumour staging. Functional imaging is useful for differentiating thyroiditis and hyperthyroidism due to autoimmunity, toxic nodule, or multinodular goitre. This chapter describes the clinical features of different thyroid disorders; discusses thyroid investigations and their clinical utility; and highlights specific tests used for specific disorders.
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Abbreviations
- bHCG:
-
Beta human chorionic gonadotropin
- CT:
-
Computer tomography
- FNA/C:
-
Fine needle aspiration/cytology
- fT3:
-
Triiodothyronine
- fT4:
-
Thyroxine
- MRI:
-
Magnetic resonance imaging
- RTSH:
-
Resistance to thyroid stimulating hormone
- TG Ab:
-
Antithyroglobulin antibody
- TIRADS:
-
Thyroid imaging reporting and data system
- TPOAbs:
-
Antithyroid peroxidase antibody
- TSH:
-
Thyroid stimulating hormone
- TSHoma:
-
Thyroid stimulating hormone secreting pituitary adenoma
- TSH receptor antibody:
-
Thyroid stimulating hormone receptor antibody
- US:
-
Ultrasound
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Stokes, V.J., Arfan, R., Aung, T., Fazal-Sanderson, V. (2019). Thyroid Investigations. In: Llahana, S., Follin, C., Yedinak, C., Grossman, A. (eds) Advanced Practice in Endocrinology Nursing. Springer, Cham. https://doi.org/10.1007/978-3-319-99817-6_27
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