Relationship of Common Vascular Anatomy to Cannulated Catheters

Table 1

Vein sizes by location in adult and pediatric patients.

Adult findings	Vein diameter avg	% of veins with diameter 1.5x a standard 20-gauge PIV (>1.62 mm)
Hand ()	2.0 sd 0.7	71%
Forearm ()	2.9 sd 1.0	93%
AC ()	4.4 sd 1.8	97%
Pediatric findings	Vein diameter avg	% of veins with diameter 1.5x observed PIV (50% 22 G, 50% 24 G)
Hand ()	1.7 sd 0.8	86%
Forearm ()	1.9 sd 0.6	94%
AC ()	3.4 sd 1.5	100%

sd = standard deviation.