an agent that prevents the clotting of blood, such as oxalate citrate, EDTA, or heprin.
sheared opening ay the anterior end of the needle. Needles should enter the vein with the bevel side of the needle "up" or visible to the lab personnel.
tests preformed to see how fast and how well the patient is capable of forming a clot.
evacuated tube system
a vacuum tube system for drawing blood by venipuncture. It allows multiple samples to be drawn with a single puncture.
the increase concentration of red blood cells due to the decreased plasma volume.
the breakdown of red blood cells, with the release of hemoglobin into the plasma or serum. In general, hemolyzed specimen are not acceptable for testing.
jaundiced; characterized by high level of bilirubin. Iceteric serum and plasma appear dark yellow or greenish.
median cephalic vein
one of the major veins of the inner arm. It is used frequently in venipuncture.
median cubital vein
a short vein of the inner arm just below the elbow. It is used frequently in venipuncture.
also known as hub or adapter; the plastic holder into which the postier end of the needle is secured.
quantity not sufficient (QNS)
when the amount of the specimen is not adequate and therefor testing cannot be preformed.
the yellowish liquid portion of the blood after the blood has been allowed to clot; it does not contain firbrogen; fibrogen is in the clot.