NPO
From Gomerpedia
NPO is code for nothing/nada/nil per oral, often placed before patients undergo procedures like upper or lower endoscopy. Before a patient is ever made NPO, a long discussion takes place between the ordering provider and patient regarding the risks and benefits of becoming NPO as it can, at times, go away and cause death by starvation.<ref>Patient “Starving to Death” After 1 Hour NPO, Actually Starves to Death Another Hour Later].
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