T3 blood Ranges?: I am told by a Consultant... - Thyroid UK

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T3 blood Ranges?

Pascha1
Pascha1

I am told by a Consultant surgeon that ranges are based upon the normal average 1000 people who use that blood lab! and this time he promises me its not a money budget thing ! and 5X of people will go either way on the range and drs should allow for this !

So have I been given a dud deal as most other places I see have a T3 top of range is at 6 plus? and where i get tested it is only 4.9

My T3 feels better at 5.9 and bit over but I get told i'm over dosed..

is it possible most of the normal people may have just had a lower T3 at my Lab than other areas it seems a bit of a bad way to set ranges by to be honest

Is this a fair way to set a range as don't most people have bloods done as they are unwell , unless they are having an operation to which I don't think they test the thyroid unless you are on medication or they suspect Thyroid disease ?

I

12 Replies
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I think your consultant is telling porkies. I doubt any lab pays for 1000 healthy people to have blood tested. I doubt they interview people, ask them questions about how they feel, ask about family history etc. I suspect (at best) what they do is use the results from a certain number of people whose blood has been sent for testing for all sorts of conditions but who haven't been diagnosed with a thyroid condition. I also suspect the number of people is more like 30 than 1000, but maybe I'm just too cynical.

So have I been given a dud deal as most other places I see have a T3 top of range is at 6 plus? and where i get tested it is only 4.9

My T3 feels better at 5.9 and bit over but I get told i'm over dosed..

When making these comparisons between your own results and ranges, and results of ranges from other people, are you absolutely certain that the units of measurement are the same?

The 2006 Guidelines state that ‘where possible manufacturers reference ranges should be confirmed locally using an adequate population size of at least 120 ambulatory subjects’.

They also state the reference population should not be suffering from thyroid disease, and should be ‘otherwise well’.

As far as I know, they just take a bunch of people with no diagnosed thyroid disease and use their results - reported to be often hospital or lab staff. I'm sure the ideal would be to interview them etc, but I really don't think that happens - so they could easily include people with undiagnosed hypo or DIO2 gene problems

Question why would a (normal person) get there thyroid bloods tested anyway.

It was only after my TT was removed that I had one.

These experts i.e. doctors and Endos have in my opinion (no so called normal people) to go by I would love someone to randomly test these (normal) people ) where on earth do they obtain the ranges from?

Pascha1
Pascha1
in reply to Bunnyjean

i agree i was only tested as was hyper and thats only because i was in a thyroid toxic crisis then after sub thyroidectomy was tested yearly till they diagnosed me with Hypo .. so I never was tested when i was normal as you said I doubt they even test people unless they suspect thyroid disease as its not really a general thing to test,, they may test women that are pregnant but to get a normal result from someone who is pregnant isn't normal as their hormones are flying all over the place..

Another point to normal on a T3 test is this is very rarely checked don people at all even when hypo ! so I think this is an unfair way to get the average range form..

And seems ive copped out with people having lower T3s than other areas :(

Bunnyjean
Bunnyjean
in reply to Pascha1

It would be good to look at medichecks and Blue horizon plus other to see their ranges the only trouble is they sometimes alter these so called range.

I know that last year when on 3 grains of NDT my FT3 was 8.2. The top range with Blue Horizon was 6.8 I was over medicated and also losing too much weight. Are you in the UK?

Pascha1
Pascha1
in reply to Bunnyjean

yes UK

Valarian
Valarian
in reply to Bunnyjean

No idea how they find the ‘normal’ people to test, @Diogenes might have some idea, as he has been involved in research. They won’t be pregnant, as there are separate ranges for pregnancy.

The way it was explained to me is that the difference between reference ranges is driven partly by differences in equipment and methodologies. In theory, if you have your thyroid levels tested simultaneously by two labs using different reference ranges, the results should fall at pretty much the same percentage point of the range.

Have a look at diogenes response on this thread:

healthunlocked.com/thyroidu...

Pascha1
Pascha1
in reply to greygoose

Thank you very much greygoose

greygoose
greygoose
in reply to Pascha1

You're welcome. :)

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