Tip - How Long Before a TB Test Shows Results? | eHow

How Long Before a TB Test Shows Results?. TB, which is short for tuberculosis, can be fatal if it's not treated properly. In fact, according to the Centers for Disease Control, it was once the No. 1 cause of death in the United States. TB is tricky because once you breathe in the bacteria, which is the only way to get it, your immune system can...