The maximum length of time that may pass between the collection of a blood sample and the separation of cells from plasma or serum is two hours, according to CLSI.
Using a tiny needle, a phlebotomist, a member of the medical field, will draw blood from a vein in your arm during venipuncture. A small amount of blood will be collected into a test tube or vial once the needle has been placed. The needle may sting somewhat when it enters or exits your body.
A vein is punctured in order to collect blood. It is typically carried out for laboratory testing.
The sample is taken by puncturing it with a needle and sucking it through the needle into a designated collection tube.
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