The sample tube is under vacuum. Once the needle is in the vein, the tube is pressed on to the needle and the blood is drawn automatically into the sample tube
by vacuum
until the required amount is collected.
What is an evacuated tube in phlebotomy?
Blood is usually collected into plastic tubes called evacuated tubes (rarely glass tubes are used because. they may break). The tubes contain
a vacuum
, which assists in the filling of the tube. The evacuated. tubes have a stopper with a septum that is punctured by a needle.
How the evacuated system works in phlebotomy?
syringe. The evacuated tube system (ETS) is the standard equipment used for routine venipuncture. It consists of a needle device, a tube holder, and an air-evacuated tube. You attach the needle device to the tube holder, insert the needle into the
vein
, and engage the tube.
When do you use evacuated tube system?
The evacuated tube system is the most commonly used means
of collecting specimens
. This system is preferable to the needle and syringe since it allows the blood to pass directly from the vein to the evacuated tube.
What is the evacuated method?
• Order of Draw (Syringe or Evacuated Tube Method):
The discard tube is
drawn to eliminate the dead space (air)
in the line of the butterfly which may act to reduce the volume of blood drawn, thereby resulting in an under-filled tube.
What are the 3 main veins to draw blood?
The antecubital area of the arm is usually the first choice for routine venipuncture. This area contains the three vessels primarily used by the phlebotomist to obtain venous blood specimens:
the median cubital, the cephalic and the basilic veins
.
What size needle do you use for blood?
21-gauge needles
are the most commonly used for venipuncture, while 16-gauge needles are commonly used for blood donation, as they are thick enough to allow red blood cells to pass through the needle without being broken; In addition, the thicker caliber allows more blood to be collected or delivered in a shorter …
Which site should you avoid for venipuncture?
Do not use the
tip of the finger
or the center of the finger. Avoid the side of the finger where there is less soft tissue, where vessels and nerves are located, and where the bone is closer to the surface. The 2nd (index) finger tends to have thicker, callused skin.
What is the smallest needle to draw blood?
The smallest gauge,
25
, is used primarily with pediatric patients. 1 The short needle length allows the phlebotomist to insert it at a shallow angle that can increase the ease of use. Usually, there is a safety device that slides over the needle to lock it after it has been used to minimize the risk of needle stick.
What is the best site for venipuncture?
The most site for venipuncture is
the antecubital fossa located in the anterior elbow at the fold
. This area houses three veins: the cephalic, median cubital, and basilic veins (Figure 1).
What is the order of draw using evacuated method?
Standard order of draw:
BLOOD CULTURES, royal blue, red, light blue, SST (Gold), green, tan, yellow, pink, pearl, lavender
. If a coag tube (light blue) is the only tube or the first tube to be drawn, a 5 mL discard tube must be drawn first.
What are the three components of an evacuated tube system?
The evacuated tube system requires three components:
the evacuated sample tube, the double-pointed needle, and a special plastic holder
. One end of the double-pointed needle enters the vein and the other end pierces the top of the tube, and the vacuum aspirates the blood.
What is the purpose of blood collection?
Collecting blood samples is a frequently used
method to diagnose and monitor diseases
, and thanks to blood samples, long and sometimes painful examinations can often be avoided. Blood condition says something about the patient’s overall health condition and reveals more specific diseases and conditions.
How does the evacuated system work?
The absorber plate is bonded to a copper pipe, and fluid passed through the pipe collects the
heat
for transfer to a hot water system. The whole assembly is sealed within a glass tube containing a high vacuum, virtually eliminating heat losses by convection or conduction.
What is blood drawing called?
A procedure in which a needle is used to take blood from a vein, usually for laboratory testing. A blood draw may also be done to remove extra red blood cells from the blood, to treat certain blood disorders. Also called
phlebotomy and venipuncture
.
What is the maximum time a tourniquet should be left on?
Tourniquets should generally remain inflated less than 2 hours, with most authors suggesting a maximal time of
1.5 to 2 hours
. Techniques such as hourly release of the tourniquet for 10 minutes, cooling of the affected limb, and alternating dual cuffs may reduce the risk of injury.
