venipuncture

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venipuncture

 [ven″ĭ-pungk´chur]
surgical puncture of a vein; see illustration.
Needle placement during venipuncture. To obtain good blood flow, the needle is positioned correctly in the vein lumen. The needle should not rest against the upper wall of the vein or puncture through the vein wall on the opposite side. From Malarkey and McMorrow, 2000.

ven·i·punc·ture

(ven'i-pŭnk'chūr, vē'ni-),
The puncture of a vein, usually to withdraw blood or inject a solution.

venipuncture

(vē′nĭ-pŭngk′chər, vĕn′ĭ-)
n.
Puncture of a vein, as for drawing blood, intravenous feeding, or administration of medicine.

venipuncture

The puncture of a vein with a needle with the intent to either obtain blood or administer a therapeutic substance. See Phlebotomy. Cf Cut-down.

ven·i·punc·ture

(ven'i-pŭngk'shŭr)
The puncture of a vein, usually to withdraw blood or inject a solution.
Enlarge picture
VENIPUNCTURE: Antecubital area of arm showing proper veins for venipuncture

venipuncture

(ven'i-punk?chur) [L. vena, vein, + punctura, a point]
Puncture of a vein, typically to obtain a specimen of blood. The pain of venipuncture may be diminished by several methods, including application of cold to the area just prior to the puncture; injection of sterile, normal saline intracutaneously to produce blanching of the site; and use of a local anesthetic to produce a wheal at the site.
See: intravenous infusion; illustration

ven·i·punc·ture

(ven'i-pŭngk'shŭr)
The puncture of a vein, usually to withdraw blood.
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So the butterfly method doesn't always give you the fraction in smallest form."
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Initially, John was unable to explain why the butterfly method got the right answer.