Which IV gauge is commonly used for children and elderly with frail veins?

• A. 18 gauge
• B. 24 gauge
• C. 14 gauge (large bore)
• D. 20-22 gauge

Answer: (B)

Choosing IV catheter size hinges on balancing vein fragility with the needed infusion rate. For children and elderly with frail veins, the goal is to use the smallest catheter that will still deliver the prescribed therapy. In IV access, larger bore (lower gauge) catheters offer faster infusion and allow rapid transfusions, but they also cause more venous trauma and are harder to place in delicate veins. A small-bore catheter reduces vein irritation, lowers the risk of infiltration, and is easier to insert in fragile veins while still providing maintenance fluids and many standard medications. If a rapid infusion or blood product administration becomes necessary, a larger bore can be used, but for routine access in these patients, a smaller gauge is the preferred choice.