Breath analysis is a growing field in medical research and drug testing. Characterization of compounds in human breath can be used for non-invasive diagnosis of diseases, assessment of physiological functions, therapy control, and pharmacokinetic studies. Human breath contains hundreds of VOCs, many at trace concentration levels. Analysis demands ultra-low detection limits, broad dynamic range, and fast time response. With unmatched sensitivity and mass resolving power, the Vocus PTR-TOF is a cutting-edge solution for online analysis of VOCs in breath.