Thyroid Function Testing: A Brief Update
Regulation of Thyroid Hormone Secretion
April 2009
Just to remind ourselves briefly about thyroid function and its regulation, it’s a typical and classical negative-feedback endocrine regulation system. The pituitary gland secretes thyroid-stimulating hormone, or TSH for short, which in turn interacts with the thyroid gland and makes it produce increased amounts of thyroxin, also known as T4 for short, and triiodothyronine, also known as T3 for short. Both of those provide negative feedback on the hypothalamus and the pituitary gland, and assay levels increase the levels of TSH downregulated, a classical thermostat.
Regulation of Hormone Secretion |
Jump to section:
- Introduction
- Thyroid Disease
- Regulation of Thyroid Hormone Secretion
- Targets for Assessment of Thyroid Function
- Targets for Assessment of Thyroid Function, cont.
- Targets for Assessment of Thyroid Function, cont.
- Targets for Assessment of Thyroid Function: Biological Considerations
- Targets for Assessment of Thyroid Function
- Balancing It All Up - What Test to Use When
- Initial Diagnosis
- Balancing It All Up - What Test to Use When
- Balancing It All Up - What Test to Use When, cont.
- Balancing It All Up - What Test to Use When, cont.
- Balancing It All Up - What Test to Use When, cont.
- Balancing It All Up - What Test to Use When, cont.
- Balancing It All Up - What Test to Use When
- Appendix - The Key Assays
- Appendix The Key Assays-TSH
- Appendix The Key Assays-FT4
- Questions?
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