Arterial needle and catheter sizes by site and body weight

Artery	<10 kg		10-40 kg		>40 kg
Artery	Needle/catheter size*	French size	Needle/catheter size*	French size	Needle/catheter size*	French size
Radial, posterior tibial, dorsalis pedis, or brachial	25 or 23 / 24 or 22		23 / 22		23 or 21 / 22 or 20
Femoral or axillary	23 / 20 or 18	3.0-4.0	23 or 21 / 18 or 16	4.0-5.0	21 / 18, 16, or 14	5.0-6.0
Umbilical		3.5-5.0

* Needle and catheter sizes refer to gauge.

Adapted from: Torrey SB, Saladino RA. Arterial puncture and catheterization. In: Textbook of Pediatric Emergency Procedures, 2nd edition, King C, Henretig FM. (Eds), Lippincott Williams & Wilkins, Philadelphia 2008. p.715.

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