Inclusion Criteria:  Adult subjects (≥ 18 years old) with diabetes or suspected ketonemia. Adult subjects (≥ 18 years old) that are healthy. Subjects willing and able to consent to participating in the study. Subjects whose pre-screen ketone value, if performed, is deemed valuable to the study.  Exclusion Criteria:  Subjects unable to consent to participating in the study. Subjects possessing a cognitive disorder or other condition, which, in the opinion of the investigator, would put the person at risk or seriously compromise the integrity of the study.