Researchers ascertained the blood loss and transfusion needs in severe and morbid obese patients undertaking total knee arthroplasty (TKA). Following primary TKA, greater blood loss or higher red blood cell (RBC) transfusion needs were not demonstrated by severely and morbidly obese patients vs non-obese and obese Class I patients. Possibly, this was noted because obese Class II -III patients had higher estimated blood volume (EBV) but similar RBC losses.

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