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What we need to know when use blood collection tube
The vacuum blood
collection system consists of a double-pointed needle, a plastic holder
or adapter, and a series of vacuum tubes with rubber stoppers of various
colors.
The evacuated tube collection system will
produce the best blood samples for analysis.
The blood goes directly from the patient
vein into the appropriate test tube.
Vacuum collection tube is glass or plastic tubes sealed with a partial
vacuum inside by rubber stoppers.
The air pressure inside the tube is
negative, less than the normal environment.
After inserting the longer needle into the
vein, the phlebotomist pushes the tube into the holder so that the shorter
needle pierces the stopper.
The difference in pressure between the
inside of the tube and the vein causes blood to fill the tube.
The tubes are available in various sizes
for adult and pediatric phlebotomies
Anticoagulants are already in the tubes in
the precise amount needed to mix with the amount of blood that will fill the
tube.
The color of the stopper on each tube
indicates what, if any, anticoagulant the tube contains.
It is important to completely fill each
tube so that the proportion of blood to chemical additive is correct,
otherwise, the test results may not be accurate or the specimen will be
rejected and will need to be recollected.
It is also important to thoroughly mix the blood with the additive by gentle inversion.
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