3. Monitor the patch.
If the patch still exists after 24 hours, the results are normal. If the patch disappears or mostly disappears in less than 24 hours, it is supposed to indicate some degree of deficiency. Significant lightening or complete disappearance in less than 18 hours is said to indicate a moderate to severe iodine deficiency and suggest a need to supplement.
How Accurate is the Iodine Skin Patch Test?
Over the past 100 years, the use and application of iodine transdermally onto the skin has been used extensively for iodine supplementation and has been found to be an effective way to supplement the body with iodine. (5) In 1989, scientists tested the amount of iodine absorbed through the skin of 24 adult males and found that it was absorbed through the skin and also effective at delivering the essential mineral iodine to the body. (6)
Although several recent studies have demonstrated increases in iodine levels through skin absorption, this test is not perfect. It's designed to give you a good idea of how quickly your body absorbs iodine, but it may not be 100% accurate, because other outside factors do exist. (7,8)
For example, other factors play a role in the disappearance of the orange color stain of iodine from the surface of the skin like, evaporation affected by ambient temperatures and atmospheric pressure. If you want a laser accurate way to test your iodine status, schedule an iodine loading test with your physician.