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Medical needles are currently available in a wide variety of diameters and lengths. In most cases, specific sizes are chosen to administer drugs, insulin, vaccinations and other substances. It is also used for extracting fluids and tissues.
The correct needle gauge and length are defined by several factors, some of which include the specific tissue, patient populace and injection preparation. Some needles involve the use of 22 to 21 gauge sizes, which are inserted as deep as 25 to 38 mm in order to withdraw blood.