Nothing by mouth
Withholding oral ingestion of food and fluids for medical purposes / From Wikipedia, the free encyclopedia
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Nothing by mouth is an American medical instruction meaning to withhold food and fluids. It is also known as nil per os (npo or NPO), a Latin phrase that translates to English as "nothing through the mouth". Nil by mouth is the term used in the UK (NBM), nihil/non/nulla per os, or complete bowel rest.[1] A liquid-only diet may also be referred to as bowel rest.[2]
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NPO is one of the abbreviations that is not used in AMA style; "nothing by mouth" is spelled out instead.