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The page below is a sample from the LabCE course Phlebotomy. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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  • Needles come in many sizes.
  • The size of the needle is called the gauge.
  • The larger the needle, the smaller the gauge number.
  • For most routine venipunctures, a 21 or 22 gauge needle is used.