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While an 18-gauge, or a catheter measuring 0.234 inches (about 5.94 mm), used to be the standard, the development of short peripheral catheters with smaller but stronger walls made it possible to use a smaller size for a larger fluid flow.
Click the play button to activate. Which size IV catheter to use depends on the patient and on the reason for IV therapy. For most adults, a 20- to 22-gauge catheter is adequate for infusing fluids and medication. A 22- to 24-gauge catheter is best for children, older adults, and anyone who has small or fragile veins.