TSH remains suppressed

[Vicky789]

So, been taking 125mcg levo and 12.5mcg Liothyronine for years, but recently lost some weight, and started randomly throwing up. Blood tests at Dr showed,T4 19.9 (11-23)

TSH <0.01 (0.27-4.5)

So wanting to feel better, I reduced the t3 to 6.25mcg, and levo to 100mcg

Nurse practitioner agreed to check t3 also,

Bloods 10 weeks later

T4 18.4

T3 3.97 (3.1 - 6.8)

TSH 0.07

I have been feeling much better, but I am also recovering from (I hope), me/cfs, so still spend much time sleeping.

Question is, if t3 and t4 are not high, why is TSH still suppressed?

Thanks in advance

[tattybogle]

1) TSH can take a very long time to come back up if it's been low for a long time ... it's called hysteresis.

if you want to see research papers discussing this then Go to first reply on this post: healthunlocked.com/thyroidu....

and look for the bit about hysteresis right at the end of the first reply , it starts:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

To understand why TSH stays supressed for a long time ... "

note~ that reply continues much further down the post , it starts:

Continued "HYSTERESIS"

2) your TSH has risen a bit since lowering your dose and since when taking T3 it will tend to be lower anyway it may, or may not, rise more over time .

[Vicky789 in reply to tattybogle]

A wealth of information! Thank you so much