Continued taking of Iodoral has repaired the defect in the Sodium Iodide Symporter which is most responsible for absorption according to the Iodine docs.
You may have to experiment on going up to 75 or 100 mg until you start absorbing better.
A small percentage of people taking the urine Iodine loading test experienced the Iodine they took with the test go right through them into the urine. Almost none of it was absorbed. They raised the Iodoral dosage and retook the test every three months until they observed absorption -- which also correlated with improved symptoms.