Usually, fluid removal from an ultrafiltrator is in the range of ______________mL/min.

The fluid removal from an ultrafiltrator is typically in the range of 30–50 mL/min. This rate is optimal because it balances the need for effective fluid management during procedures such as cardiopulmonary bypass while minimizing potential complications that could arise from over- or under-removal of fluid.

At this rate, ultrafiltration can effectively remove excess fluid from the blood without compromising hemodynamic stability. This is crucial in maintaining the volume status and ensuring that the patient's organs continue to receive adequate perfusion. The 30–50 mL/min range also aligns with the physiological capabilities of the ultrafiltration membrane and the properties of the blood being processed, leading to efficient solute clearance as well.

While other rates might be mentioned, they typically do not reflect standard practice or are associated with increased risk or suboptimal efficiency in fluid removal during perfusion. Thus, the range of 30-50 mL/min is accepted as a standard for effective ultrafiltration in clinical practice.