Mother of 12 year old needing advise

[Refat]

Hi all, I havent posted anything for a while as all was ok. My 12 year olds levo was increased to 75 mcg from 50 mcg in May this year. She was full of energy again after a few weeks and constipation had gone. Bloods were done in July and tsh was 1.4 (ref rang 0.2 to 4.5)and t4 was 18 (ref range 11 to 21) endo refuses to test t3. Test was done at 10.45 am. But recently constipation and tiredness has returned as well as thinning of hair too. She is due a blood test on Tuesday at 8.30 It will be tsh and t4 only, but i spoke to GP and had to fight to have ferritin and vitamin d included. I think she will probably need a dose increase but im worried that wouldnt 100 mcg appear to be a lot for a 12 year old. Are there any other parents on this forum who have experienced similar issues? she is about 55 kg in weight and I have learned that adults levels are usually 1.6 mcg per kg. After doing some reading childrens vary as they grow and for my daughters age recommended dose is around 2mcg of levo per kg per day. When will her thyroids become stable?

[Refat]

Sorry just to add celiac test was also done in july which came back negative. The last time her b12 and folate was checked was back in jan last year, not sure of the exact results but b12 was below mid range. I will ask for readings when we go for bloods. I am intending to start off with vitamin b complex.

[diogenes Remembering]

1.6 mcg/kg is only an indication. One can go up to 1.9 so 100 mcg wouldn't seem too excessive. Also your daughter is growing, so her dose needs to grow with her increase in weight. Children pre-puberty also should have FT3 about 10% higher than adults, so the increased T4 may help her achieve that.

[Refat in reply to diogenes]

Many thanks for your reply. My daughter started her periods last Feb just before lockdown and she is still growing too. So the body demands more during this time? if that is the case then it has put my mind at ease. xx

[Hay2016 in reply to Refat]

Definitely need ferritin testing then. Still fighting to get my daughters ferritin up. Hopefully hers is good. Should get b12/folate done too. Xx

[jimh111]

Children turn over thyroid hormone quicker than adults so the adult 1.6 mcg / kg rough approximation doesn't apply so much, especially in young children. Best to go by fT4 and how she looks and feels.

[elwins]

Make sure you get a printout of results for future reference. I started my periods at a young age not sure of age probably 10 or 11, from what I can gather due to my under active thyroid. My mother was warned that might happen. keep the copy of my results so I can look back when I need to. We are legally allowed copies. Best of luck in sorting things out, your daughter is lucky having you helping her, as I was with my mother.

[Refat]

Thank you to all for replying.