Today's Countdown Conundrum: negative TSH

[hose1975]

Just had my first batch of post-starting T3 results. Not got fT3 yet but TSH has come back with a negative value. How on earth is this possible? How can you measure something that isn't there?

[Clutter]

Hose, Under 0.01 is often called zero or undetectable. I have had TSH 0.001 result.

[hose1975 in reply to Clutter]

This was definitely minus 0.0 something!

[helvella Administrator Thyroid UK in reply to hose1975]

Are you absolutely sure it didn't have:

<0.01

That is, less than 0.01 (or some other number).

[hose1975 in reply to helvella]

Given that the results were relayed by a receptionist I suppose it's a possibility, but she did seem very sure.

[Healthseeker]

Could it just be a typo? I'm totally convinced the decimal point was in the wrong place on my last TSH test.

[faith63]

thyroid meds can suppress TSH and so can a pituitary problem.