Table 1: Vein sizes by location in adult and pediatric patients.

Adult findingsVein diameter avg % of veins with diameter 1.5x a standard 20-gauge PIV (>1.62 mm)

Hand ()2.0 sd 0.771%
Forearm ()2.9 sd 1.093%
AC ()4.4 sd 1.897%

Pediatric findingsVein diameter avg% of veins with diameter 1.5x observed PIV (50% 22 G, 50% 24 G)

Hand ()1.7 sd 0.886%
Forearm ()1.9 sd 0.694%
AC ()3.4 sd 1.5100%

sd = standard deviation.