just had a thyroid function test as complained to GP of not being able to regulate my body temperature very well. As the weather gets colder so do I which might seem normal but it’s dropping as low as 33.5* when air temperature is 19 degrees C. Thought of winter approaching is worrying as had this problem all last winter too. It doesn’t take much drop in air temperature to make me feel abnormally cold!
The GP only tested Serum TSH which came back normal at 1.5 miu/l (range 0.3-5.00) so my worry seems to have been dismissed.
Is this result misleading? Do I need to request more tests and if so what would they be? I am 72 and on 75mcg levothyroxine daily - had one lobe removed many years ago.
Happy to pay for private testing if one can be recommended.
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Bev1951
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For full Thyroid evaluation you need TSH, FT4 and FT3 tested
Also both TPO and TG thyroid antibodies tested at least once
Very important to test vitamin D, folate, ferritin and B12 at least once year minimum
About 90% of primary hypothyroidism is autoimmune thyroid disease, usually diagnosed by high thyroid antibodies
Autoimmune thyroid disease with goitre is Hashimoto’s
Autoimmune thyroid disease without goitre is Ord’s thyroiditis.
Both are autoimmune and generally called Hashimoto’s.
Have you ever had thyroid antibodies tested?
20% of autoimmune thyroid patients never have high thyroid antibodies and ultrasound scan of thyroid can get diagnosis
Low vitamin levels are extremely common when hypothyroid, especially with autoimmune thyroid disease and especially as we get older
what vitamin supplements are you currently taking
Stop taking any supplements that contain biotin 5-7 days before any test
In U.K. medics hardly ever refer to autoimmune thyroid disease as Hashimoto’s (or Ord’s thyroiditis)
Recommended that all thyroid blood tests early morning, ideally just before 9am, only drink water between waking and test and last dose levothyroxine 24 hours before test
This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)
How long have you been left on just 75mcg levothyroxine
Which brand of levothyroxine are you taking
Approximately how much do you weigh in kilo?
Private tests are available as NHS currently rarely tests Ft3 or all relevant vitamins
List of private testing options and money off codes
Thank you very much. I will ask my GP if he will repeat and extend test - if he won’t get a full test done privately!
Test was done in the morning but after thyroid dose and breakfast…🙈
I’ve been on 75 for a long time - it was raised once as high as 125 but experienced bad palpitations at night so reduced to a “comfortable “ for palpitations level.
Never had any of the other thyroid checks done, my consultant put me straight onto levothyroxine following the removal of one lobe due to a follicular adenoma in 2009.
I weight 65kg and struggling to lose weight in spite of a small appetite - breakfast and one other small meal about 5:00pm. Rarely anything else other than a biscuit with a cup of tea in the day! My 3 sisters all have underactive thyroids in case it’s relevant!
The present review of the literature regarding B12 status among vegetarians shows that the rates of B12 depletion and deficiency are high. It is, therefore, recommended that health professionals alert vegetarians about the risk of developing subnormal B12 status. Vegetarians should also take preventive measures to ensure adequate intake of this vitamin, including the regular intake of B12 supplements to prevent deficiency. Considering the low absorption rate of B12 from supplements, a dose of at least 250 μg should be ingested for the best results.3
Many vegetarians, all vegans, and most of us as we get older, are likely to be low in vitamin B12.
Vegetarian diets are usually low or very low, vegan diets are usually extremely low, and as we get older, we are less able to absorb any B12 that is present.
If it is just to ensure we get enough, 50 to 100 micrograms a day is likely enough. But if we have any real impairment, we might need 500 or 1000 micrograms a day.
helvella has pointed out the likelihood of vitamin B12 deficiency. However, before taking any B12 supplement it's advisable to get your current B12 level tested.
Your GP can do this, but, NHS tend to only do a basic serum B12 test, which isn't the best way to know your true B12 status. Ideally, you need an Active B12 test.
You can do a fingerpick test at home for Active B12. This one is good value and includes other tests which are also useful. monitormyhealth.org.uk/anae...
Testing TSH is the usual NHS GP pathway but as I learned from this forum and others, it doesn't give the full picture. They should do the full raft of tests. 75mcgs is low too, but I know they only look at the TSH numbers. They should really listen to all your symptoms. I did have to persist and beg for more Levothyroxine. I have also reduced my symptoms a lot by taking the gluten free route and have so much less pain and brain fog to name 2 symptoms. I have never had private blood tests so I'm sorry I can't comment on that point. Good luck with GP.
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I feel the cold. 
Hypothyroidism and cold temperatures
HERE IS A SIMPLE AND ACCURATE TEST FOR HYPOTHYROIDISM
Hypothermia in hypothyroidism 
Low body temperature and being too hot
