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TSH, FT's...Fluctuation questions


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Old 09-19-2008, 11:19 PM   #1
one2wonder
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TSH, FT's...Fluctuation questions

If with hashi's you can you can flux with your tsh within the day, does your FT's do the same? How can you ever stabilize with meds with fluxing?

 
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Old 09-20-2008, 01:20 AM   #2
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Re: TSH, FT's...Fluctuation questions

TSH is not released by your pituitary gland in a steady stream, but is "pulsatile". TSH is known to vary widely in many people over a 24 hour period. It is lowest at the point that you fall asleep at night, and starts to rise shortly after falling asleep. In a healthy person, it is highest in the early morning hours (probably 2-3am, assuming a 10 o'clock bedtime). That said, you can see why your TSH might be highest in the morning, and lower in the afternoon or evening.

T3 and T4 levels are more stable, but are also prone to fluctuations, as well. Free T3 and Free T4 tests are not accurate if done within 8 hours of taking a thyroid pill. Only T4 will be affected, if you are taking a T4 med (synthroid, Unithroid, Levoxyl, etc), only T3 will be affected if you are taking Cytomel, and both will be affected if you are taking Armour, thyrolar, or some combination of T3 and T4.
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Old 09-20-2008, 01:22 AM   #3
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Re: TSH, FT's...Fluctuation questions

To clarify, TSH fluctuation is not just a Hashimoto's thing. TSH is cyclical, by nature, and will fluctuate--more in some than in others, but the fluctuation is there by design, in nature, even in "healthy" people
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Old 09-20-2008, 07:56 AM   #4
one2wonder
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Re: TSH, FT's...Fluctuation questions

Well...then why on earth do most docs dose on the tsh and not the free ts?

 
Old 09-20-2008, 01:11 PM   #5
Meep
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Re: TSH, FT's...Fluctuation questions

That is a question that I have asked for years. The answer has to do with training. Most doctors are taught in med school that TSH is the golden reference, and that it is not necessary to measure Free T3 and Free T4.
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Last edited by Meep; 09-20-2008 at 01:12 PM. Reason: my typing is rather comical and must be corrected.

 
Old 09-20-2008, 03:00 PM   #6
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Re: TSH, FT's...Fluctuation questions

Wow, Meep, been a long time! Welcome back!

 
Old 09-21-2008, 01:54 AM   #7
Meep
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Re: TSH, FT's...Fluctuation questions

*blushing* Thanks! It is good to be back. :-)
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Old 09-21-2008, 08:19 AM   #8
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Re: TSH, FT's...Fluctuation questions

I heartily second that "Welcome back"!

 
Old 09-21-2008, 04:55 PM   #9
Meep
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Re: TSH, FT's...Fluctuation questions

Thanks, again. It is great to see some friendly and familiar screen names, that I remember from way back then. :-)
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