Breath gas analyzers for medical diagnostics for detecting infectious diseases, carcinomas, Helicobacter pylori, ketosis, and asthma; Diagnostic apparatus used in implementing diagnosis and screening tests designed to detect bacterial, viral, fungal, and protozoa infectious diseases and non-infectious diseases, namely, cardiovascular, circulatory, respiratory, pulmonary, digestive tract, vascular, neurological, carcinomas, injury- and age-related biological insult and congenital conditions, Helicobacter pylori, ketosis, and asthma; Diagnostic apparatus, namely, devices to detect biomarkers in patients for diagnosing or treating bacterial, viral, fungal, and protozoa infectious and non-infectious diseases, namely, cardiovascular, circulatory, respiratory, pulmonary, digestive tract, vascular, neurological, carcinomas, injury- and age-related biological insult and congenital conditions, Helicobacter pylori, ketosis, and asthma; Medical apparatus and instruments for monitoring health blood properties and respiratory events, namely, point of care and personal use breath collection and analysis systems; Medical diagnostic apparatus, namely, vapor sensing machines to diagnose bacterial, viral, fungal, and protozoa infectious and non-infectious diseases, namely, cardiovascular, circulatory, respiratory, pulmonary, digestive tract, vascular, neurological, carcinomas, injury- and age-related biological insult and congenital conditions, Helicobacter pylori, ketosis, and asthma, and assist in determining treatment