What is the primary purpose of administering packed red blood cells (PRBC) prior to a liver biopsy?

Administering packed red blood cells (PRBC) prior to a liver biopsy primarily serves to ensure adequate blood volume. The liver biopsy procedure can pose a risk of bleeding due to the vascular nature of the liver. By increasing the blood volume and improving the oxygen-carrying capacity, administering PRBC helps to stabilize the patient and minimize the potential complications associated with blood loss during and after the biopsy. This preparation is especially important in patients who may already have compromised platelet function or clotting abilities due to underlying liver disease, thus enhancing their hemodynamic stability and reducing the risk of hemorrhagic events.