• There is a size 24 gauge that is mostly used for pediatrics due to its small size. There are also 16 gauge needles that are used primarily for ICU or surgery. Nevertheless, 18, 20, and 22 gauge is the size you'll encounter most frequently in most areas of nursing.


  • 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

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