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Complex Question obout TSH, T4, and T3 correlation

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Old 08-13-2003, 02:43 PM   #1
Join Date: Jun 2003
Location: youngstown
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Wonderingwhy HB User
Question Complex Question obout TSH, T4, and T3 correlation

This is probably a complex question, but any oppinions I could get on it would be great. At age 12, I had a TSH of 7.45, low normal T4 and free t4, but high out of range T3, and free T3. I am now 20 years old, and have a TSH of 2.62, with low normal T4/t4free ( about the same as when I was 12) and my T3 and free T3 are now in the middle of the normal range. So my question is this, Why was my TSH so high when I was younger? I'm supposing it's because of the high T3, but if so, why haven't my T4 levels skyrocketed up since my TSH has gone back to normal levels now? I may be wrong, but isnt' T3 converted from T4 in other parts of the body other then the thyroid? could a problem lie there?

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Old 08-13-2003, 05:40 PM   #2
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Meep HB UserMeep HB UserMeep HB User

Actually, it sounds like you have it backwards. Hight T3 or T4 woudl lead to a low TSH.

If your TSH is Low, it is telling your thyroid to produce less.

I think the high TSH you had as a child was either a lab error (most likely), or something was causing your pituitary to put out too much TSH (i.e sleep deprivation or pituitary tumor)

Your current pattern of labs with lowi-normal T4 and middle level T3 with slightly elevated, but normal TSH is very common. I was DIAGNOSED as hypothyroid with levels almost identical to yours.

I am not a doctor, nor have I ever played one on TV...

Old 08-13-2003, 06:20 PM   #3
Join Date: Jun 2003
Location: youngstown
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Wonderingwhy HB User

Hey Meep, ya, it does sound backwards, that's what I couldn't figure out. I have about 5 different tests from when I was 12, all with high TSH, and the low t4, and high t3. And that's what's confusing me, how can The T3 be so high, when the thyroid should be underproducing it. So that leads me to think, my body is converting the T4 to T3, and the thyroid is actually putting out a low ammount of T3 ( I'm guessing that's probably a wrong theory, but it's the only thing I can think of) Any ideas??

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