The letter notes that as long as one understands the difference between the iodine spot test without a loading dose and the 24-hour iodine loading test, there will be no confusion between "whole-body iodine sufficiency" and "iodine sufficiency.
Many health professionals, as well as commentators in forums, blogs, and newsletters, refer to the iodine loading test as an indicator of iodine sufficiency without mentioning "whole-body.
The letter questions why I did not contact any of the laboratories that offer the loading test to ask how long iodine supplementation should be discontinued before taking the test.
The iodine loading test methodology, validation, and patient testing procedures are published on the Optimox website (www.
Brownstein, Flechas, and Hakala claim that by following iodine loading test parameters, patients with the best clinical responses reached 90% or more iodine excretion during the iodine loading test.
In an online article describing the development of the iodine loading test, there is no mention of individuals discontinuing iodine supplementation before retesting to determine when whole-body iodine sufficiency is reached.