Common Venipuncture Needle Gauges with Needle Type and Typical Use

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15-17 gauge
Special needle attached to collection bag

Collection of donor units, autologous blood donation, and therapeutic phlebotomy.
Syringe - 18 gauge
Used primarily as a transfer needle rather than for blood collection; safety issues have diminished use.
Multisample syringe - 20 gauge
Sometimes used when large- volume tubes are collected or large- volume syringes are used on patients with normal- size veins.
Multisample syringe - 21 gauge
Considered the standard venipuncture needle for routine venipunture on patients with normal veins or syringe blood culture collection.
Multisample syringe - 22 gauge
Used on older children and adult patients with small veins or syringe draws on difficult veins.
Butterfly
Veins of infants and children and difficult or hand veins of adults.