Short CommunicationThe breathtaking truth about breath alcohol readings of zero

- It has been postulated that the hangover state starts when breath alcohol concentration is zero.
- Ethanol may still be present in the blood and urine during the hangover state, despite breath analyser readings of zero.
- The consensus to postpone cognitive testing in hangover studies until breath alcohol levels are zero should be reconsidered.

IntroductionIt has been postulated that the hangover state starts when breath alcohol concentration is zero.MethodsData from 2 studies that assessed ethanol in breath, blood and urine were compared.ResultsThe data revealed that ethanol may still be present in the blood and urine during the hangover state, despite breath analyser readings of zero.DiscussionAs ethanol is still present in the body despite zero breath alcohol readings, the current consensus to postpone cognitive testing in hangover studies until breath alcohol concentration is zero should be reconsidered.