How Long Does Nuclear Stress Test Stay In Your System 2021 Guide 2022. In an exercise stress test, sensors (electrodes) taped to the chest record the heart's rhythm. Radioiodine leaves your body primarily through your urine, but very small amounts can be found in your saliva, sweat and bowel movements.
As your body works harder during the test, it requires more oxygen, so the heart must pump more blood. Most of the radioiodine that does not go to thyroid tissue will be eliminated from your body during the first few days after treatment. Mine came back showing i have heart disease and now need more test i.