The consultants and specialty society members agree
that consideration should be given to staging procedures
that are anticipated to be lengthy. Members of the specialty
societies agree with the staging of procedures that
are anticipated to have substantial blood loss; consultant
opinion is split equally between agree and equivocal. All
groups agree with the staging of procedures that are anticipated
to be lengthy and have substantial blood loss. The
consultants and specialty society members consider procedures
to be prolonged when they exceed an average 6.5 h
(range, 2–12 h) in duration. They consider blood loss to
be substantial when the loss reaches an average of 44.7%
(range, 10 –200%) of estimated blood volume.