How long is the longest medical needle?

There are three main considerations for selecting the most appropriate needle — needle gauge, needle length, and intended use. The needle gauge and length should be appropriate for the type of tissue that the needle needs to go into. The intended use of the needle means that you need to know how deep the needle must go to reach the best injection area and through which tissues the needle must pass to get to the injection area.

Common needles vary in length from 3/8 inch to 3-1/2 inch (7.62 cm).

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