T4 : (tetra-iodothyronine)
[normal range is 7.0 - 9.0]
T4 is the major hormone secreted by the thyroid making up 85 - 90% of the hormone. T4 exists as both a bound and non-bound form. T4 is predominately bound to thyroid binding globulin (TBG), pre-albumin, and albumin.
If the patient exhibits an increased T value, consider the following:
- Hyperthyroidism
- Thyrotoxicosis
- Birth control pills
- Pregnancy
- Neoplasm
If the patient exhibits a decreased T value, consider the following:
- Hypothyroidism
- Myxedema
- Hypoproteinemia
- Nephrosis
- Simmonds disease
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