A single breath into a newfangled breathalyzer is all doctors need to diagnose 17 different diseases, including lung cancer, irritable bowel syndrome and multiple sclerosis, a new study found.
Researchers invited about 1,400 people from five different countries to breathe into the device, which is still in its testing phases. The breathalyzer could identify each person's disease with 86 percent accuracy, the researchers said.
The technology works because "each disease has its own unique breathprint," the researchers wrote in the study. [10 Crazy New Skills That Robots Picked Up in 2016]
The breathalyzer analyzes microscopic compounds - called volatile organic compounds (VOCs) - to detect each condition. Testing for VOCs isn't a new approach; in 400 B.C., physicians learned that smelling a patient's bodily emissions could help with diagnoses. For instance, doctors used to smell the stools and urine of infant noblemen daily, the researchers said.
But while excrement and other bodily substances, such as blood, contain VOCs, examining exhaled breath is the cheapest, easiest and least invasive way to test for the compounds, the researchers said.
To investigate using breath for diagnosis, the researchers developed a breathalyzer that had two nanolayers, one with carbon and the other without. The carbon-free layer contained modified gold nanoparticles and a network of nanotubes, both of which provide electrical conductivity, the researchers said.
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Meanwhile, the carbon layer worked as a sensing layer to hold the exhaled VOCs, the scientists said. When a person breathed into the breathalyzer, that individual's VOCs interacted with the organic sensing layer, which in turn changed the electrical resistance of the inorganic sensors. By measuring this resistance, the researchers could determine which VOCs were present, the scientists said.
There are hundreds of known VOCs in exhaled breath, but the researchers needed only 13 to distinguish among the 17 different diseases. For instance, the VOC nonanal is linked to several disorders, including ovarian cancer, inflammatory bowel disease and breast cancer, whereas the VOC isoprene is associated with chronic liver disease, kidney disease and diabetes, the researchers said.
Because each VOC is tied to several conditions, "These results support our finding that no single VOC can discriminate between different diseases," the researchers wrote in the study.
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