What is a commonly used RBC transfusion threshold for a stable adult without active coronary disease?

• A. Hb < 5 g/dL
• B. Hb < 7 g/dL
• C. Hb < 6 g/dL
• D. Hb < 9 g/dL

Answer: (B)

In a stable adult without active coronary disease, the goal is to transfuse only when needed to avoid unnecessary risks. A commonly used Hb level to trigger a red blood cell transfusion is about 7 g/dL. This restrictive approach rests on the idea that many people tolerate modest anemia, and avoiding transfusions reduces exposure to transfusion-related risks such as reactions, infections, volume overload, alloimmunization, and iron overload. Oxygen delivery depends on more than just hemoglobin; the body can compensate by increasing cardiac output and improving tissue oxygen extraction, so many patients remain adequately oxygenated at or above this level.

Evidence from trials and guidelines supports this strategy for most stable patients, showing no worse outcomes and fewer transfusions with a lower threshold compared with liberal strategies. There are exceptions, of course: if a patient has active ischemia or known significant cardiovascular disease, a higher threshold (often around 8 g/dL or higher) may be considered, or transfusion may be guided by symptoms rather than Hb alone. If symptoms such as chest pain, dyspnea, or signs of poor perfusion develop, transfusion should be reconsidered even if Hb isn’t far below 7 g/dL.