Systematic Review: Outcomes by Duration of NPO Status prior to Colonoscopy

Figure 2

Minimum time from the end of bowel preparation to procedure (blue lines) or time before procedure when liquids were stopped (red lines). Three studies did not provide sufficient information to determine a minimum time from the end of preparation to procedure (Khan et al., 2010 [36], Kolts et al., 1993 [38], and Mathus-Vliegen and van der Vliet, 2013 [43]). Studies where patients were allowed liquids until time of procedure are indicated by a time of 0.25 hours. Citations are “author, year (reference number).”