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I have just been tested for an underactive thyroid and my TSH level is 4.86. I have been told that as I had my B12 jab a week before my blood test that this could have raised my TSH level so it my not be a true reading. Does anyone know if this is the case? My doctors think this is a normal level although I have lots of symptoms including weight gain, tiredness, croaky voice, brittle hair and nails. I have changed my doctor and would just like to know how to approach this subject with them? Thanks.
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