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Old 01-24-2005, 07:55 AM   #1
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Question on determining optimal lab range

Sorry guys, a couple more questions. If most women feel best when their Free T3 is in the upper third of the range, is this determined by subtracting the lower range from the higher range, dividing by three, and adding 2/3 to the lower range? This is taxing my brain! My newest Free T3 is 3.0 with the range being 2.3-4.2. So would this make the optimum 3.56?

Should the Free T4 also be in the upper 1/3 of the range for optimum health? Does the Free T4 result reflect how well Synthroid is working? My newest Free T4 is 1.43 with the range bing 0.61-1.76. Although requested, the lab failed to run the TSH.

I will be seeing a new doctor on Wednesday, hoping that adding T3 and/or adjusting the Synthroid may help my exhaustion and brain fog. What do you all think? I am trying to learn as much as I can. Any and all advice will be greatly appreciated.


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Old 01-24-2005, 09:57 AM   #2
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Re: Question on determining optimal lab range

Subtract lower value from upper value (4.2 - 2.3 = 1.9)

Divide difference by 3 (1.9/3 = 0.633).

Top 1/3 = upper value - 0.633 = 3.57

You are correct - this is confusing to me also!

T3 is a 'brain food' according to my shrink. And it certainly works well for me - and quickly!

Good luck.

Old 01-24-2005, 06:07 PM   #3
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Re: Question on determining optimal lab range

Another way to do it, and this is how MEEP explained it, is to take the higher number and subtract the lower number, then divide by .7 (thats point 7) and then add in the lower number.
So....4.2-2.3=1.9 X.7=1.33+2.3=3.63 So your 70% target range would be 3.63

You can also find mid range by doing the same only dividing by .5

You do also want your Free T4 in the upper 1/3, they NEED to be pretty balanced and it is even more important that you keep the FT4 stable in the upper 1/3

Old 01-25-2005, 04:47 PM   #4
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Re: Question on determining optimal lab range

Thank you both very much!

lillypad, I am glad the T3 is helping you. I really need some brain food myself!

dea4, thanks for the info on the T4 ranges. I believe my Free T3 and Free T4 can use some tweaking. I will be seeing a new doctor tomorrow and I really hope he will be able to help.

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