I first had my thyroid levels tested this summer when I first became aware of having multinodular goiter. The T3 progressively continued to rise each time it was tested since, from normal range to just above the normal limit. When I had levels tested again this week, the blood work showed a sudden 70 point drop in my T3. Has anyone else ever had something like that happen? I'm not on medication or anything that could account for that. My antibodies have been tested and came back negative (no graves, no hashimoto's). Very confused! My ultrasounds were suspicious, but the FNA didn't show any problems. Of course, I keep going back to wondering if it's cancer that they didn't catch. Would love to hear if anyone else has had a similar experience.