24 hour thyroid urine tests - Are they valid?

[Guest guest]

Hi everyone

I had a 24 hour urine test done which shows abnormally low levels of T3 (out of

range) and

low (but within range) T4. On the same day I had a blood test which shows within

range FT3

and FT4 and a TSH of only 3. My doctor (an 'alternative' endo) is likely to

treat me with these

results but I feel a bit unsure whether these tests can be trusted or not.

I am just wondering if anyone knows whether these 24 hour urine tests are

actually valid? Are

they backed up by the science and if so why aren't they used more in the UK?

Many thanks

Enkai