Transfusion Reaction by Washed Red Blood Cell (RBC)

The hypothesis is that transfusion of washed red blood cell can decrease the complication by transfusion.

Inclusion Criteria:

• Patients undergoing total hip replacement arthroplasty

Exclusion Criteria:

• Patients who do not agree with this clinical study.
• Patients who have a history of transfusion for recent 1 month.
• Patients who have rare blood types.