Blood test: Typical reference ranges for normal... - Thyroid UK

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Dave583 profile image
8 Replies

Typical reference ranges for normal thyroids (uk guide)

Test From To Units

TSH

0.4 4.0mU/L (milliunits per litre)

FT4

9.0 25.0 pmol/L (picomoles per litre)

FT3

3.5 7.8pmol/L (picomoles per litre)

My levels on 100mcg Levothyroxine.

TSH 0.02

FT4 100

FT3 24.1

Stopped meds 5 weeks ago. Recent uptake scan - no traced identified

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Dave583 profile image
Dave583
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helvella profile image
helvellaAdministrator

With thyroid hormone levels that high, it is a miracle you have any detectable TSH.

I note you had a sub-total thyroidectomy and take 100 micrograms of levothyroxine.

Why did you have that sub-total thyroidectomy?

I really don't think I'd take any levothyroxine tomorrow if those were my results.

How are you feeling?

Dave583 profile image
Dave583 in reply tohelvella

I had a sub total thyroidectomy as I had graves disease. I feel fine. No symptoms of an overactive thyroid. But I did have shingles 12 weeks ago.

helvella profile image
helvellaAdministrator in reply toDave583

I suspect those test results are not reflecting your true thyroid hormone levels. Quite a number of things can interfere with these tests - one that has been mentioned here many times recently is biotin.

I have no idea if shingles could have any impact - either way. Have you been taking any medicines or supplements?

helvella profile image
helvellaAdministrator in reply tohelvella

There is at least a suggestion of an association between shingles and a history of thyroid disorders:

ncbi.nlm.nih.gov/pubmed/261...

Dave583 profile image
Dave583 in reply tohelvella

Thanks for the information

Dave583 profile image
Dave583 in reply tohelvella

No nothing at all. I 've taken the same amount of levothyroxine for 25 years and no problems. It's the second blood test in 5 weeks the only difference in the readings was that the last blood test my t4 level was 116

helvella profile image
helvellaAdministrator in reply toDave583

I suggest that a repeat test should be done by a different lab, one that uses a different technology for performing the tests. You'd need to discuss this with your doctor or choose to get a private test done. (Contact the company to make sure that you are sure any test is done with different technology.)

That can help to identify interference (though not the cause).

Dave583 profile image
Dave583 in reply tohelvella

Ok will talk to GP. Thanks for advice

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