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formula for thyroid bloodwork?

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Old 04-11-2008, 08:04 AM   #1
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alikat709 HB User
formula for thyroid bloodwork?

hi everyone,
I know I read it somewhere on here, I just cant seem to find it. I want the formula to figure out the percentages of the free t3 and free t4 , I am getting a note together for my gp and would like to pass on that info with it. Anything to help the cause lol

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Old 04-11-2008, 08:13 AM   #2
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mkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB User
Re: formula for thyroid bloodwork?


FT4 1.0 Range (0.8-1.8)
Percentage calculation: [Your value - lower range limit]/[upper range limit - lower range limit]*100 = %
[1.0-.8]/[1.8-.8]*100 = 20%

FT3 is done the same way: 260 (230 - 4 2 0)
[260-230]/[420-230]*100 = 15.79%

Other thing to note is balance. If your Fts are not with in 10 % of each other then something is off in you conversion process, adrenal T3 conversion suppression, or pituitary request for T4 to t3 conversion and further testing is necessary.

Good luck. Keep a flow chart of your labs and a daily symptom log with heart rate, BP, and temperature values. This can help more than you know when trying to track down rhythms of thyroid flux.

If we learn by our mistakes, I am working on one hell of an education.

Last edited by mkgbrook; 04-11-2008 at 08:14 AM.

Old 04-11-2008, 10:41 AM   #3
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Location: Brooklyn, NY
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neena1127 HB User
Re: formula for thyroid bloodwork?

I found this very helpful and will immediately start a journal! I can't even get the endo to acknowledge I have a problem because my TSH is still within range!

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