To qualify as a donor for autologous transfusion, a patient's hemoglobin should be at least:

To qualify as a donor for autologous transfusion, the minimum hemoglobin level required is 11 g/dL (which is equivalent to 110 g/L). This threshold is set to ensure the donor has an adequate hemoglobin concentration to safely undergo the blood collection process without risking their own health.

Blood collected for autologous transfusion is intended for the donor's own use, typically in preparation for surgery or a medical procedure where significant blood loss may occur. Maintaining a hemoglobin level of at least 11 g/dL helps ensure that the donor retains sufficient oxygen-carrying capacity and overall blood volume after donation.

Lower hemoglobin levels could indicate anemia or other health issues, which can pose risks during the donation process and subsequent recovery. Therefore, the chosen hemoglobin threshold helps safeguard the donor's wellbeing while still facilitating the practice of autologous blood donation.