Hoping someone can explain something to me as I'm new to all this. Am starting to read lots and see lots of helpful things on this site which is great but can't find answer to one thing that I find curious. Why do ranges change dependent on the lab that's used to get tests done? Had one set of bloods done in November as part of a private gynea review, these were the results:
TSH - 4.21 range 0.27-4.2, FT4 - 11.1 range 12-22
Then had blood test early Jan with local GP and these were the results:
TSH - 0.95 range 0.34-5.5, FT4 - 9.5 range 7.5-19.0
So from first test to second test my FT4 has gone down (11.1 to 9.5) but doctor saying has gone from just below normal to well within normal because of the ranges. I don't get why the ranges change and how this affects interpretation of results.
In terms of how I'm feeling.
The gynea prescribed 25mg Levothyroxine. Started early Dec and after about 2 weeks felt some improvement for a little while, then plummeted back to being excessively tired, still putting on weight really easily, dry hair, mouth and skin, feeling cold. Some days better than others. My results dont look that bad compared to others I've seen here but really can't go on feeling this rubbish. Have more blood tests next week and am pushing to get T3 and antibodies done though GP thinks lab won't do it. Am also having ultrasound on neck as GP thinks thyroid feels slightly swollen and my throat is uncomfortable.