Understanding needle size Lengths range anywhere from 12.7 mm to 4 mm, the shortest insulin pen needle currently available. Understanding gauge can be a little tricky.
Similarly, what is the biggest IV needle? Various needle lengths are available for any given gauge. Needles in common medical use range from 7 gauge (the largest) to 33 (the smallest).
Secondly, what is the smallest IV catheter?
Peripheral IV Catheter Chart
Color Gauge Size External Diameter (mm)* Green 18G 1.3 mm Pink 20G 1.1 mm Blue 22G 0.9 mm Yellow 24G 0.7 mm
What color is a 14 gauge IV?
Sizes of catheters
Gauge Outer diameter (mm) Color 14 2.10 Orange 16 1.65 Grey 18 1.27 Green 20 0.90 Pink