Menssana Research's Breathscanner 1.0 is a billion times more sensitive than a police breathalyzer, and can be used to check for asthma, ulcers, and trouble with a heart transplant.
Recent tests of the Menssana device have been encouraging. In a 2003 pilot study of 201 women, some of whom had diagnosed breast cancers, the breath test identified 88% of those cancers. The test's accuracy is comparable to a mammogram.
And in a 2004 clinical trial that involved 407 volunteers, including 195 patients with untreated lung cancer, the breath test picked up nearly 91% of the tumors.