It is possible to test a sample of breath from a patient, run it through a machine, and find out certain diseases in the patient without needing to do Xrays. It is sort of like a"breathalyser".In the future it is hoped this type of testing will be common, and allow certain conditions to be picked up early. One of these conditions is Cancer of the Larynx (voice box). It is not in wide use yet however a study has shown it is very effective in detecting Larynx cancer.