What do the results mean?You will probably be tested several times, beginning shortly after treatment ends, then every so often over time. Your results may show that:Your thyroglobulin levels are high and/or have increased over time. This may mean thyroid cancer cells are growing, and/or cancer is starting to spread.Little or no thyroglobulin was found. This may mean that your cancer treatment has worked to remove all thyroid cells from your body.Your thyroglobulin levels decreased for a few weeks after treatment, but then started to increase over time. This may mean your cancer has come back after you've been successfully treated.If your results show that your thyroglobulin levels are increasing, your health care provider may prescribe additional radioiodine therapy to remove remaining cancer cells. Talk to your health care provider if you have questions about your results and/or treatment.Learn more about laboratory tests, reference ranges, and understanding results.
