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T3U test results

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Old 06-01-2004, 09:56 AM   #1
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Join Date: May 2004
Posts: 17
readingteacher HB User
Question T3U test results

If your T3U alone is low, does that mean anything? The other tests seem to be in the normal range.

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Old 06-01-2004, 10:21 AM   #2
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Join Date: Nov 2003
Location: Delaware
Posts: 676
opalfire HB User
Re: T3U test results

Originally Posted by readingteacher
If your T3U alone is low, does that mean anything? The other tests seem to be in the normal range.
Please do not assume that anything is "normal" when dealing with thyroid. There's no such thing. There are "ranges", but everyone's normal is different (something docs have a hard time with).
Please post your labs thus:
FT3 3.3 (2.3-4.2)
FT4 0.7 (.58-1.64)

These were my first labs when I finally found a doc that would listen to me. As you can see, the results look "normal", but they're not. I felt horrible most of my adult life, which included a TSH of 5.39. The low "normal" is now 2.5, but years ago it was as high as 10. In fact, at one point I was told I was "hyper" because I was around 5 even then. Now we know different.
Please post your labs, everything you have had done pretaining to your thyroid, including the lab ranges, and we will try to help you find where you are standing and suggestions on what you can do.
Good luck and keep us posted!

Old 06-01-2004, 10:58 AM   #3
Join Date: Jun 2003
Location: Lynnwood, WA USA
Posts: 89
fromos5 HB User
Re: T3U test results

If you're on birth control pills or other hormone treatment, it is probably fine. Estrogen increases the binding of thyroid hormones, but that can be compensated for by slightly larger thyroid pill doses. My T3U number has always been low ever since starting the pill about 5 years ago. Don't worry about the T3 Uptake test. It's basically a component of the whole panel just used to determine free amounts of hormone and/or give the FTI (free thyroxine index) number, which is rarely used anyway. It just deals with the amount of binding globulin available, so often you'll see a high-normal or high Total T4 & a low T3U together. Often the T3U is not even shown on the final lab report. What's really important are your Free T3, Free T4 and TSH numbers and your symptoms. If your doc isn't concerned about it, you can be relaxed.

Old 06-01-2004, 11:03 AM   #4
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Join Date: May 2004
Posts: 17
readingteacher HB User
Re: T3U test results

Thanks, you must be a saint!!

History: Had a positive ANA test last month, 1:320 with homogenous pattern. Had endometriosis and finally had a total hysterectomy. Have suffered from fatigue, aching joints, night sweats, dry eyes, IBS, migraines and depression.

Past test results:
T3U 24.5 Range 25.0-36.0
T4 10.0 Range 4.0-11.5
TSH .81 Range .35-5.00
Free TI 8.2 Range 4.8-11.3 (Free Thyroxine index)

Newest test results:
T3U 23 Range 24.0-35.0
T4 10.7 Range 4.5-12.5
TSH 1.38 Range .40-4.00
FreeTI 8.2 Range 4.8-11.3

They were looking for lupus, but that doesn't seem likely. Have been diagnosed with osteoarthritis. Thanks for your help with this!

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