title: Abstinence from smoking and expired-air carbon monoxide levels: lactose intolerance as a possible source of error.
abstract: We investigated a possible source of contamination of expired-air carbon monoxide (CO) readings on CO monitors from raised expired-air hydrogen (H2) levels, namely lactose intolerance, the norm in certain ethnic groups. A significant correlation between expired-air CO and H2 readings was observed in four non-smoking lactose maldigesters.
authors.affiliation: Addiction Research Unit, Institute of Psychiatry, London, UK.
authors.forename: A D
authors.initials: AD
authors.lastname: McNeill
authors.forename: L A
authors.initials: LA
authors.lastname: Owen
authors.forename: M
authors.initials: M
authors.lastname: Belcher
authors.forename: G
authors.initials: G
authors.lastname: Sutherland
authors.forename: S
authors.initials: S
authors.lastname: Fleming
mesh_terms: D001944:Breath Tests / Q000592:standards*; D002248:Carbon Monoxide / Q000032:analysis*; D005189:False Positive Reactions; D006801:Humans; D006859:Hydrogen / Q000032:analysis; D007787:Lactose Intolerance / Q000235:genetics / Q000378:metabolism*; D044469:Racial Groups; D012907:Smoking / Q000235:genetics / Q000378:metabolism
chemical_list: D002248:Carbon Monoxide; D006859:Hydrogen