how to check iodine deficiency
But not only has this lead to an increase in iodine deficiency, but many people have a bromine toxicity because of this. Two Primary Methods To Determine If Youâre Iodine Deficient. There are two main methods of determining if you have an iodine deficiency: Iodine Testing Method #1: The Iodine Patch Test. This is the least accurate of the two testing methods. This involves painting a 2 x 2 âpatchâ of 2% iodine tincture on oneâs forearm, and then seeing how long it takes for the patch to disappear.