We have tried the following criterion for classification:
For a person to be Normal, all of the following must be true:
- TSH: 0.5≤TSH≤4.5
- T3: 80≤T3≤200
- T4: 4.5≤T4≤12.0
A person is classified as Hypothyroid if:
- TSH is High (TSH>4.5TSH > 4.5TSH>4.5)
- T3 is Low (T312.0)
Kindly help.
Although TSH is good indicator for pituitary thyroid access being normal but some times this is not always true in case of pituitary adenoma seco d most comon cause of pituitary secreting adenoma is TSH secreting tumor from pituitary after prolactinoma (most comon cause) there will be high TSH which is the cause of Goiter and hyperthyroidism but elevated TSH (dys organized pituitary thyroid axsis )
Other cause is hypothalamus lesion here we need THRH which in fact released from hypothalamus to affect pituitary so Thyroid stimulateing hormone Releasing hormone
And in hypothyroidism also can interfere with same mechanism
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