When administering blood by IV, what gauge needle or catheter should be used?

When administering blood products intravenously, an 18 gauge needle or catheter is recommended as it provides a balance between adequate flow rates and patient comfort. The use of an 18 gauge allows for sufficient blood flow to prevent hemolysis and ensures that the transfusion can be completed within the appropriate time frame, which is critical in reducing the risk of transfusion reactions.

Larger gauge needles, such as 14 or 16 gauge, are often unnecessary for most adult patients and can be uncomfortable. Using a 20 gauge may be too small in certain situations, particularly if rapid transfusion is needed, such as in trauma cases. Thus, while the other options might be suitable in specific contexts, the 18 gauge is typically the standard for blood transfusions, ensuring both efficacy and safety during the administration process.