I aimed to get my bloods done before the Booster but the clinic did not take enough blood so I ended up having to go back after the Booster for a second set of bloods.
It's interesting that two sets of tests taken 2 weeks apart are quite different and perhaps the jab can reduce T4 and drive up TSH?
Would be interested in views or experiences.
Exactly the same protocol each time, fasting bloods = no medicines in the morning.
Covid Booster was received on 24 Jan.
Previous post I asked if you have autoimmune thyroid disease, Hashimoto’s ….do you?
With Hashimoto’s levels change constantly
What vitamin supplements are you currently taking
What were most recent vitamin D, folate, ferritin and B12 results
Yes to Hashi’s
But my Dec and Jan T4 and TSH are stable, then it changes a bit after the injection.
Ferritin, B12 and D are relatively good (not amazing) and I’ve not checked Folate - will do next time. I supplement D, B12 is mid range and Ferritin is lowish but there’s another issue causing that (alpha thallesemia) so it’s a red herring.
After the booster (or any vax) your body would recognise "intruders" and the white blood count would go up. My white blood cell count was high after the second vax, and I pointed out to the GP (who said I must have an infection) why I thought this was as he had not thought about it. Whether this caused a dip in the effectiveness of the thyroid I have no idea, but I do know when we are ill it does affect the levels.
TSH changes every half an hour, as it is pulsar, and can vary by 50% over the day.
I have come to the conclusion the only accurate test is how hard it is to get up in the morning! 
Hi Wired123,
I had bloods done on April 8 2021. Bloods at the time were: FT4: 16.6 (12 - 22) and FT3: 6.38 (3.9 - 6.7).
I had my first covid shot (pfizer) on April 23. I ended up going to the hospital because my heart rate was at 120 and I couldn't get it to settle down. They did a thyroid panel at the hospital. Results were: FT4: 14.1 and FT3 4.57 with the same reference ranges.
Both times I was on 112.5 mg ERFA. That's a significant drop which I don't think can be attributed to anything but the pfizer vaccine.
Bloods went back up by the time I had my next test.
PS. I don't bother with TSH because I have central hypothyroidism and TSH is suppressed at <0.01.
That’s a really good data point (although sorry to hear about your jab side effects), I think both yours and my results show some impact from the vaccine. Guess there’s a month-long window where the thyroid is impacted by the jab. I do remember my first jab i was very tired for a whole month and then it magically went away.
Yes I think so too. My second jab also seemed to affect results but not as noticeably. The blood draw was further away from the jab than the first, so harder to tell.
Covid Autum booster is there a poll?
Covid booster vaccination : Graves Disease 
Invited For Covid Jab
Autumn Covid Vaccine Booster
Flu jab and blood test
