1. Post-operative reduction in Hgb - Measure pre-operative Hgb levels and post-operative days 0, 1, 2, and 3 Hgb levels. Among the studies presented, they used different time points to determine the reduction in Hgb. They either used the post-operative 12-hour Hgb, post-operative day 4 Hgb, or the lowest Hgb during the hospitalization. Because we rarely have patients stay until post-operative day 4, we will have to make our measure off a different time period. We have patients get discharged as early as post-operative day 1, so we'll probably have to use the post-operative day 1 Hgb level. We feel a Hgb level difference of >1 g/dL is clinically significant.