Medical devices for the collection of volatile organic compounds; medical devices for the concentration of volatile organic compounds; medical devices for the analysis of volatile organic compounds; medical devices for detecting and monitoring bacteria; medical devices for detecting and monitoring infectious diseases; medical devices for detecting and monitoring disease biomarkers; medical devices for detecting and monitoring pathogens for medical purposes; medical device for detecting and monitoring odorants; medical devices for detecting and monitoring metabolic health profiles; medical devices for detecting and monitoring biochemical processes; medical devices for detecting and monitoring analytes.