Free t3 level has dropped even tho FT4 has increased and TSH now below 1. Advice please..

[suzafc]

After 6 weeks on new dose levo 150mcg my ft3 has fallen!

TSH 0.36 mu/L range 0.35-5.50

FT4 17.2 pmol/L range 10.3-22.7

Ft3 4.0 pmol/L range 3.1-6.8

after 2 weeks of taking 150 mcg Levothyroxine my results were:

THYROID STIMULATING HORMONE 1.35 mIU/L 0.27 - 4.2

FREE THYROXINE 16.5 pmol/l 12.0 - 22.0

FREE T3 4.7 pmol/L 3.1 - 6.8

On 125mcg results were

TSH 3.84 mu/L range 0.35-5.50

FT4 13.6 pmol/L range 10.3-22.7

Does this mean the coversion is not happening or that I am converting to RT3, some symptoms have improved but my basal temps are still low.

Thanks in advance

Sue

(ps am already supplementing d and b12 and have done a genova 24hr cortisol test..awaiting results)

[Clarebear]

This happened to me when I started thyroxine. Before starting my TSH was 18.0, Ft4 was 13.2 and Ft3 was 4.2. Six weeks later on 50mcg my TSH was 5, FT4 was 18.0, but Ft3 had dropped to 3.9.

My endo eventually agreed that this did indicate a possible conversion issue. He agreed to me taking Armour, which contains direct T3, and this has really helped xx

[Jackie]

Hi This is common, why frequent tests to start with until bloods and you feel OK. Increases in meds each time needed. It normally takes about a year to be stable.It also looks as if you would benefit form some T3 with the T4 ( Levo). Most of us find we need FT3 to be near the top of range and T4 top third. Half way there with a good GP who will still test for FT3. Then you need the other related tests.The alternative to T4 and T3 is armour etc but most docs will only give it on a private script and even those prefer to first try T4 and T3. I hope that helps.

Best wishes,

Jackie

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