I'm slightly confused as I have not been diagnosed with a thyroid condition but have a lot of symptoms of it, then last year I went into hospital with my heart (SVT) and had bloods taken whilst in hospital. My thyroid showed borderline overactive so I have been 're tested it shows borderline underactive I am due to have a heart procedure for the SVT but have requested my thyroid be checked again before I proceed with it . Can anyone tell me what borderline means please? I didn't ask for the tsh levels which I wish I had now as this is really bugging me
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