The state of urinary iodine is not related to either TSH or Free T4

[diogenes]

This paper shows that TSH and FT4 in blood does not reflect urinary iodine levels. This indicates the thyroid is flexible to iodine supply and is robust to limited iodine in diet.

Do Thyroxine and Thyroid-Stimulating Hormone Levels Reflect Urinary Iodine Concentrations

Soldin OP, Tractenberg RE, Pezzullo JC. Ther Drug Monit.

2005 Apr; 27(2):178-85. PMID:15795649

[LindaC]

Thank you diogenes - you are such a wealth of knowledge and information... so refreshing in these times. 🥃

[humanbean]

Link to full paper : ncbi.nlm.nih.gov/pmc/articl...

[Raoudha]

Precious information thanks

[jgelliss]

Thank you Diogenes for a wealth of very informative and valuable information you so kindly share with us.Most appreciated.