Thyroid UK

new blood

Today I got my new blood results, please advise whether I am on the correct dose of thyroxine which is 125mg:

Description Value Range

VIT D 22.3 50.00

GLUCOSE 5.9 3.00---9.0

FT3 5 3.80----6.0

SERUM TSH LEVEL 0.016 0.34---5.60

FT4 15.1 8.00----18.00

FERRITIN 13 11.00----200.00

HBA1C 6.1 4.00----6.00

B12 SERUM 264 140.00

FOLATE 10.8 4.00

5 Replies

16york68 How do you feel? Your thyroid results are looking pretty good.

However, your Vit D, ferritin and B12 aren't. They're a very long way from optimal.

Vit D is recommended to be 100-150 if unit of measurement is nmol/L

Ferritin should be half way through it's range.

B12 should be top of it's range, even 900-1000.

1 like

Thanks Susie, I am now on vitamin D replacement tabs for 6 months. So do you think I should be taking B12 as well?

I have had chronic anaemia twice in 2016 , do you think thyroxine is correctly dosed ?


Yes, you need to supplement B12 as well. Get some Solgar or Jarrows sublingual methylcobalamin lozenges 5000mcg and take 1 daily. When you've finished the bottle get the 1000mcg dose and take 1 daily as a maintenance dose.

When supplementing with B12 we need a B Complex to balance the B vits. Start the B12 first, add in the B12 after a couple of weeks, that way if there is any reaction you will know what caused it.

I presume your GP has prescribed Vit D. What has he given you? What dose? He wont have told you this because he wont know it (they don't get taught nutrition) but when you take D3 you also need to take it's important co-factors K2-MK7 and magnesium.

Vit D aids absorption of calcium from food and K2 directs the calcium to bones and teeth where it is needed rather than arteries and soft tissues where it can get deposited and cause problems. D3 and K2 are fat soluble so should be taken with the fattiest meal of the day.

Take D3 4 hours away from Levo.

Magnesium comes in different forms, check here and see which will suit you best. As it is calming, take magnesium in the evening

As you've had chronic anaemia, I would speak to your GP about your ferritin level. You need to keep this topped up. Did you have iron infusions? When your level gets topped up again you need to keep it there. Iron supplements can do this or eating liver once a week. As iron supplements need to be kept 4 hours away from thyroid meds and any other meds and supplements (because it affects their absorption), the liver option is much easier.

As for the question as to whether your dose of Levo is correct, again - how do you feel? If you feel well then you're on the right dose. If you don't feel well then the very poor nutrient levels will have something to do with that and will need addressing. You need optimum levels of nutrients for thyroid hormone to work.

Your GP wont like your very low TSH as it is so far under range but your FT4 and FT3 are at pretty good levels so you are not overmedicated (which is what my GP would say with your TSH level).


Thanks for that advice Susie, will get some vitamin B12 . The vitamin D dose is 0.25microgram. I am diabetic as well as having no thyroid, and am controlling that by diet , so I do eat ALL fresh food, and make my own bread. Hopefully once the vitamin D kicks in I will feel better


Are you sure that the Vit D dose is 0.25mcg? That converts to 10iu. 1mcg = 40iu so 0.25mcg = 10iu.

A normal maintenance dose of D3 for someone who is at the recommended level is 2000iu during the winter.

Even if it's 25mcg that would only be 1000iu.

For a Vit D level of 22.3nmol/L you really need a loading dose of 10,000iu daily for about 4-6 weeks then reduce to 5000iu daily. Or you could take 5000iu daily and it will take longer to reach the recommended level.

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