Continuing the search for knowledge...

[steviecat]

Just wondered if anyone can answer this. If you are hypo and Free T3 is good - top of the range, or somewhere handy to it; is it possible to have a minus TSH - below zero, I mean? Apologies if this is a daft question, but you know how it is; one mulls things over...

[diogenes Remembering]

Not in reality, but if some TSH tests have a zero standard that really isn't zero, then a patient's sample with a TSH lower than the "zero standard" will show negative.

[steviecat in reply to diogenes]

Ah, that makes sense. Many thanks, Diogenes

[steviecat in reply to steviecat]

Although if zero isn't really zero, how negative can one be, I wonder?

[Clutter in reply to steviecat]

Steviecat,

It depends how low the assay registers. I've had <0.0001 and <0.001 both described as undetectable.

[steviecat in reply to Clutter]

I rather like the sound of that, Clutter - 'undetectable', that is I have that experience with my own doctor: his knowledge is quite undetectable

[SeasideSusie Remembering in reply to steviecat]

" I have that experience with my own doctor: his knowledge is quite undetectable "