Are there nationally set set parameters for min... - Thyroid UK
Are there nationally set set parameters for minimum and maximum levels of T4, T3, and TSH,, or does each Health trust's lab set its own?
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HilaryB
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helvellaAdministratorThyroid UK
The reference ranges are related to the lab and the testing technology they use. Quite possibly every single lab in the country has at least slightly different ranges.
I do not know how labs fit to trust boundaries - but it seems likely that at least some labs will do work for more than one trust, and some trusts might even have more than one lab. So I doubt whether trust boundaries are the defining aspect.
Rod
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