What is rT3?
During the metabolism of the thyroid incretion,
T4 get ride of Iodine in outside of No. 5 of benzene ring will become
T3. However, if the inside Iodine of No.5 of benzene released it will
cause rT3. rT3 is not active in our body. Its concentration in the blood
proportional changes with T3 and T4, especially with T4’s change.
It can also to be the index of the hypothyroid. Some of the hyperthyroid
only have the high rT3 when in the early stage. It increase very quickly
and to be the key index if get seriously cacotrophia or some systemic
disease.
rT3 is useful in following:
1. To be used to diagnose hypothyroid is 100% correct. Its concentration
increasing is much sensitive than TT3 and TT4.
2. To be used to diagnose the anti-thyroid medication. TT3 falls quickly
in the hyperthyroid treatment, while rT3 falls slowly. When TT3 reaches
the normal range, T4 will lower than the normal range. So, if both rT3
and T4 lower than the normal range, it means excessively in medication.
3. To be used to diagnose hypothyroidism. For such case, rT3 is much
important than TT3 and TT4. But TSH is still to be the key index to
diagnose hypothyroidism.
4. To be used to observe the treatment of Hypothyroidism. The sequence
for the Hypothyroidism treatment by thyroid incretion are TT3, rT3,
TT4 and then TSH. So combine rT3 result with TT3 and TT4 value can judge
the curative effect. If rT3 and T3 rise quickly while T4 is in the normal
range, it means the thyroid incretion is excessively used.
5. To be used to diagnose chronically lymphocyte hypothyroid. rT3 rise
very quickly when it is acute miocardial infarction, hepatocirrhosis,
diabetes, uraemia, cerebrovascular disease and tummy cancer. TT3 and
TT3/Rt3 drop quickly. rT3 is very meaningful to the judgement and the
over savation of non-hypothroid, especially the TT3/rT3.
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