In most critically ill adults, what is the typical hemoglobin threshold to trigger packed red blood cell transfusion?

• A. 7 g/dL
• B. 9 g/dL
• C. 8 g/dL
• D. 10 g/dL

Answer: (A)

In critically ill patients, a restrictive transfusion approach is preferred: transfuse only when the hemoglobin level falls to about 7 g/dL. This strategy reduces exposure to blood products and their risks without compromising oxygen delivery for most ICU patients. Large randomized trials in critical care compared a liberal threshold (around 9–10 g/dL) with a restrictive threshold (around 7 g/dL) and found similar or better outcomes with the lower threshold, along with fewer transfusions and transfusion-related complications. Therefore, 7 g/dL is the typical trigger for transfusion in most critically ill adults. Exceptions exist for patients with acute coronary syndrome, significant ongoing bleeding, or other specific conditions where a higher threshold may be considered, but the standard approach for the majority is around 7 g/dL.