helvella - Iodine Patch Test
Why the iodine patch test is not appropriate for indicating iodine status.
In addition to the issues identified in the linked document, application of iodine directly to the skin can cause damage such as blistering. This seems to be fairly unpredictable but is more likely with repeated applications to the same area.
The ability of iodine to pass into skin is affected by surface tension. This, in turn, is affected by the precise formulation of iodine used and by the state of the skin. Use of any creams, oils, detergents (including bath additives, shower gels, soaps, etc.) could well leave residues sufficient to have a significant effect. The natural oiliness/dryness of the skin will also affect absorption.
Various diseases such as ringworm (tinea) impact absorption of iodine. Some enhance absorption; others reduce it. (Other diseases referred to include pityriasis versicolor, pityriasis rosea, eczema marginatum and mycotic eczema.)
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helvella - Iodine Patch Test
Why the iodine patch test is not appropriate for indicating iodine status.
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Iodine Testing
