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. Author manuscript; available in PMC: 2010 Mar 18.
Published in final edited form as: J Gerontol A Biol Sci Med Sci. 2008 Apr;63(4):408–413. doi: 10.1093/gerona/63.4.408

Table 1.

Rules for Determining Whether Pressure Ulcer Was Hospital Acquired

Available Information Stage 1 Stage 2 Stage 3 Stage 4 Stage Unknown
≥1 Source says present at admission, and no source says absent at admission Definitely preexisting Definitely preexisting Definitely preexisting Definitely preexisting Definitely preexisting
≥1 Source says absent at admission, and no source says present at admission Definitely not preexisting Definitely not preexisting Definitely not preexisting Definitely preexisting Definitely not preexisting
≥1 Source says present, and ≥1 source says absent at admission Possibly preexisting Possibly preexisting Possibly preexisting Definitely preexisting Possibly preexisting
No source says present or absent at admission Definitely not preexisting Possibly preexisting Possibly preexisting Definitely preexisting Possibly preexisting