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Posted 12/26/2013 12:19 PM (GMT -5)
I have (another) question on thyroid testing ...

My tsh had been getting lower (officially in the low range 5 weeks ago) since August, and the free T4 was getting higher (not as fast as the TSH was getting lower though).

I was given a script to get it rechecked in 6 weeks, but had it done earlier this week, because I couldn't make it to be tested at the exact 6 week mark (and with the end of the year, I wanted to get it done before my insurance deductible reset).

Anyway, i got the new results from the lab today (no word as of yet from doctor's office, due to the holiday):
*TSH went from being .38 (normal range 0.450-4.500) five weeks ago, to 1.62 (0.450-4.500) earlier this week. (both of these tests were done at the same lab).

*The T4 free(direct) went down to 1.17 (normal range 0.82-1.77)

I understand that the levels fluctuate, but the TSH seems like a huge change confused

Just wondering if that's normal to happen, and if not, what could it indicate?
Posted 12/26/2013 12:47 PM (GMT -5)
Actually, TSH is produced by the pituitary gland in response to the free T4 levels in the circulating blood. It can change pretty quickly as it's a shorter-acting hormone and doesn't stay in the body long. T3 and T4 hormones hang around working for six weeks or so, and their levels therefore change much more slowly.
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