The Lab Me at home comprehensive thyroid test allows you to see if you have too little, or too much, iodine and selenium, and/or exposure to the iodine/selenium antagonists bromine, arsenic, and mercury; determine Free T4 and Free T3 levels, and monitoring thyroid replacement dosages. Note: This is not a diagnostic test and cannot confirm any specific illness or disease. Further testing and medical consultation may be required to determine the cause of abnormal results.