Intravenous (IV) catheter flow rates

Catheter size (diameter, length)	Flow rate with gravity	Flow rate with pressure
22 gauge, 25 mm	35.7 mL/min	71.4 mL/min
20 gauge, 33 mm	64.4 mL/min	105 mL/min
18 gauge, 45 mm	98.1 mL/min	153 mL/min
16 gauge, 50 mm	155 mL/min	334 mL/min
14 gauge, 50 mm	236 mL/min	384 mL/min

Data from: Reddick AD, Ronald J, Morrison WG. Intravenous fluid resuscitation: Was Poiseuille right? Emerg Med J 2011; 28:201.

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