"Palpate" a vein....
This is an acquired skill. A vein will have an elastic feel when lightly compressed and then released. There will also be a "collapse" sensation when it is compressed that will be distinctly different than the surrounding tissue. As most veins suitable for drawing blood will run along the long axis of the extremity these sensations should be detectable as you trace the path of the vein.
The best way to learn is to start by palpating visible veins, then following the path of the vein as in passes deeper in the surrounding tissue. You may be surprised how far you can feel the vein once you do some practicing.
With a constriction band (tourniquet) in place the feel of the vein will be more pronounced. Practice palpating a vein without one to get good at it!
when you hit the blood vein
phlebotomy or venipuncture
There are three veins to choose from when drawing blood. The first choice is Median Cubital. Second is Cephalic vein and lastly the Basilic vein.
bloodletting i thinkANS2:The answer is Venipuncture. ANS3:Try "Phlebotomy"
median cubital vein
Its a temporary connection between a vein and artery used for dialysis and drawing blood.
cannula
Venipuncture is the medical term used when drawing blood. Basically, it means your vein has had a needle stuck into it for some purpose.
A syringe is a great technique for blood drawing! It allows the phlebotomist to control the vacuum, which is good because it is much less traumatic on a patient's vein. A syringe may also be used to obtain blood from a small, or otherwise difficult vein.
Blood test usually can be done in a doctor's office or in a lab where the technician drawing the blood will clean the skin, insert a needle into a vein.
After the blood began to flow, the needle may have been inadvertently moved. When this happened, the needle either advanced forward or backward. If forward, the bevel may moved to rest against the vein wall, or went through the vein. If backward, the needle may have come out of the vein, but not out of the arm.
The median cubital vein is a superfical vein in the upper arm. It connects to other veins like the basilic and the cephalic vein and is a common vein used for drawing blood.