回複：體檢表被醫生加了一句， X-ray發現有鈣化點，推薦防禦性治療

Your case is different from "TB test 陽性，x-ray 正常". X-ray發現有鈣化點 suggests you may have TB previously, but never been diagnosed and self-cured (if there was a TB patient in your family, contract TB was very easy). If you have never taken TB medicine, it is possible that few sleeping TB bacteria are still in your body, and may become active when you get old and have weak immune system (in this case, better take medicine now). Dependent on your family history, consult a TB expert.