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To draw blood during a routine venipuncture, your health care provider will attach a hollow needle to a syringe, vacuum tube or vial, then gently insert the needle through the skin and into the center of the vein.Blood drawn from your vein will flow through the needle into the attached receptacle.onsiderations. As an alternative to venipuncture, for some tests you may have a small blood sample drawn from your finger by a method called a fingerstick. Similarly, If your infant or young child needs to provide a blood sample, his doctor might use a device called a lancet to withdraw blood directly from the skin.
Larger butterfly needles (i.e. 21G) are typically used on patients where larger quantities of blood are needed for testing (i.e. blood cultures). Butterfly Needles. When performing venipuncture, the butterfly needle is typically held by folding the âwingsâ and then placed into the vein (generally at a shallow angle).When the needle is inserted into the vein, a âflashâ can be seen.he tubing on a winged infusion blood collection needle allows for greater flexibility when performing blood draws on âdifficultâ veins. Smaller butterfly needles (i.e. 23G) are typically used on geriatric, pediatric (infants/children), patientâs with âdifficultâ veins or dermal puncture from the patientâs hand.