Please Help *** Iodine/thyroid test

Does anyone tried to do an Iodine test at home???

There is a simple way to tell if someone has low iodine(maybe thyroid problem) by
painting the foot(soles) with iodine(before going to sleep).
It's what i did last night, and i checked in the morning to see if the Iodine was absorbed entirely or just partially. I was surprised to see that was not trace of Iodine left of the foot.Please help me understand this:
does this means that i have a low iodine level???

LZ