Acute Normovolemic Hemodilution

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** A method of intraoperative blood conservation in which whole blood is drained by gravity into a collection bag where it is mixed with anticoagulants and maintained at room temperature. As the blood is collected, an intravenous fluid is infused to maintain normal blood volume. The collected blood can be transfused to the patient during and/or after surgery as needed.

**Synonyms:** - Acute Isovolemic Hemodilution - IAD - Intraoperative Autologous Donation