Q4.

What is FT3?

About 99.97% T4 and 99.7% T3 in plasm connected with plasm protein by non covalent bond. The Free T4 and T3 are very small. T4 or T3 that is connected with protein is in homeostasis with FT4 and FT3. The dissociative incretion can enter into cell and connected with accepted part in the cell to affect the compound of the protein and the adjustment of the metabolism. It can also reflexly adjust the secretion of TSH in the pituitary. The thyroid protein does not affect FT4 and FT3. The state of the hypothyroid is tied up with FT3 and FT4. The sensitiveness and special particularity far exceed TT3 and TT4. The normal range of FT4 is from 9 to 25prmol/L, FT3 is from 3 to 9pml/L(RIA). The difference exists by different laboratory.

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