Here is a comment from a well known thyroid doctor's site.
"Iron deficiency is shown to significantly reduce T4 to T3 conversion, increase reverse T3 levels, and block the thermogenic (metabolism boosting) properties of thyroid hormone (238-242). Thus, iron deficiency, as indicated by an iron saturation below 25 or a ferritin below 70, will result in diminished intracellular T3 levels. Additionally, T4 should not be considered adequate thyroid replacement if iron deficiency is present."
Please post your thyroid related test results and reference ranges shown on the lab report. And even more important, please tell us about any symptoms you are having.
I should add my results---
Iron Binding TIBC 333 (250 to 450)
UIBC 261 (150 to 375)
Iron, serum 72 (35 to 155)
Iron Saturation 22 (15 to 55)