It's not that simple, Once you have been exposed to TB, you will always test positive. A chest X-ray is the only way to know if the TB is active or not(that I'm

It's not that simple, Once you have been exposed to TB, you will always test positive. A chest X-ray is the only way to know if the TB is active or not(that I'm aware of currently). Source: I'm one of those that always test positive to TB tests.