Which test is required to know whether a tablet has gone into lungs instead of stomach?

You do not need a te: If a tablet gets into the lung you will know it right away because it will cause you a bad spell of coughing which will not stop until the pill is out of the lung. I doubt you need any tests provided you did not have an attack of coughing when you were trying to take this pill. A ct scan of the lung is quite good to pick up anything more than minor problem with the lungs.