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A member asked:
Low t3 (liothyronine) uptake (21%), normal tsh (3.190), normal t4 (9.4), normal free thyroxine index (2.0). also low bun/creatine ratio (7). is this normal?
4 doctors weighed in across 2 answers
Normal!: The T3-uptake is one of the most misunderstood tests in thyroidology (real word). It does not actually measure any thyroid hormone or function! The T3-U is used to calculate a more accurate T4 when maybe on certain medications, be pregnant, menstrual cycle time...all of which may effect the T4 level. If used your T4 should say FTI, T7 or have some other disclaimer. You can pretty much ignore it.
Answered 11/29/2015
1.9k views
YES: T-3 Uptake not a reliable test....the rest of your thyroid tests are normal and your kidney function is as well!
Answered 9/4/2016
1.9k views
Related Questions
A member asked:
Hi, could someone please help me decipher my test results? Tsh 2.100 range 0.450-4.500 thyroxine (t4) 4.5 4.5-12 T3 (liothyronine) uptake 31 24-39 free thyrox
A doctor has provided 1 answer
A member asked:
TSH 1.160 (0.091 in 9/2022) T4 9.7, T3 uptake 21, Free T3 3.6, Free Thyroxine Index 2.0, NP wants to start on low dose Levothyroxine due to low T3 uptake, even though others levels WNL. Should I start taking it or not? 31, female, fatigue, wt gain?
2 doctors weighed in across 2 answers
A member asked:
Test done: thyroxine (t4) 12.4 range 4.5-12.4 T3 (liothyronine) uptake 33 range 24-39 TSH 0.01 range 0.450-4.500 . I am on levo 150mg last 60 days. What it means ?
A doctor has provided 1 answer
A member asked:
Tsh level is 9.23 HIGH (0.450-4.500) Thyroxine T4 6.4 ( 4.5-12) T3 uptake 27 (24-39%). free thyroxine index 1.7 what does it mean?
A doctor has provided 1 answer
A member asked:
I just received lab results showing the following: thyroid tsh 15.060 high thyroxine (t4) 6.2 t3 uptake 26 free thyroxine index l.6?
2 doctors weighed in across 2 answers
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