NEEDLE GAUGE refers to the size of the bore or hole in the needle. The higher the gauge, the thinner the needle (and the smaller the hole). A 28 gauge needle (abbreviated 28G) is therefore thinner than a 25 gauge needle, which is in turn thinner than an 18 gauge needle. Different gauge needles are used for different administration methods (see below).
NEEDLE LENGTH. Insulin needles are typically 1/2 inch in length and tuberculin needles are typically 5/8 of an inch in length. As inscribed on packaging, needle length appears after the gauge number: "28G 1/2" refers to a 28 gauge needle that is 1/2 inch long. http://www.erowid.org/psychoactives/hardware/hardware_syringes.shtml
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