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For children at low risk of aspiration, the ASA recommends clear fluids up to two hours prior to procedures
Proceedings of the National Academy of Sciences of the United States of America 111 , 25542559, doi:10.1073/pnas.1312570111 (2014)
Low levels can be measured in a blood test
References: Healthline
About the authorView full bio Michael Stewart, MRPharmS Medicine Leaflet Review Manager Contractor, Pharmacist BPharm (Hons), MRPharmS Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years experience advising on medicines and medical conditions
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