what is the purpose of performing a venipuncture? to puncture the vein for a removal of a venous blood sample. this is performed when a large amount of blood is needed.

What is the purpose of blood draw?

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.

When performing venipuncture What is the purpose of the order of draw which is the order in which the vacuum tubes are to be used?

The order of draw is based on CLSI Procedures and Devices for the Collection of Capillary Blood Specimens; Approved Standard - Sixth Edition, September 2008. This standard recommends that EDTA tubes be drawn first to ensure good quality specimen, followed by other additive tubes and finally, serum specimen tubes.

What is an indication for venipuncture?

Indications. Allows the sampling of venous blood for the diagnosis of electrolyte imbalances, infection, blood type and crossmatching, disease states, drug levels, etc.

What is the importance of locating the vein?

Locating the vein will help in determining the correct size of needle.

Venipuncture Procedure

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What is the purpose of performing laboratory test on serum?

Serum tests are performed by drawing blood from a patient and spinning it down to separate the cellular components from the liquid serum, which contains soluble analytes such as hormones.

What does order of draw mean in phlebotomy?

Blood samples must be drawn by phlebotomists in a specific order to avoid cross-contamination of the sample by additives found in different collection tubes. Phlebotomy order of draw is the same for specimens collected by syringe, tube holder, or into tubes preevacuated at the time of collection.

What's the order of draw in phlebotomy?

The recommended order of draw for plastic collection tubes is:

• First - blood culture bottle or tube (yellow or yellow-black top)
• Second - coagulation tube (light blue top). ...
• Third - non-additive tube (red top)
• Last draw - additive tubes in this order:

What does drawn blood mean?

1 : to take blood from a person's body for medical reasons We need to draw some blood to test you for the virus. 2 : to cause blood to flow from a person's body The punch to the nose drew blood.

Why is blood drawn in a lab?

Also called a blood draw or venipuncture, it's an important tool for diagnosing many medical conditions. Usually the blood is sent to a laboratory for testing. But sometimes the blood is withdrawn as a treatment for certain medical conditions. This is called therapeutic phlebotomy.

Is venipuncture the same as phlebotomy?

Phlebotomy specifically refers to the single-use needlestick for drawing blood specimens. Whereas venipuncture refers to the broader concept of entering the vein for either drawing blood or administering an IV for an extended period, phlebotomy is limited to blood-sample collection.

Which vein is the first choice for venipuncture?

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 does EDTA stand for in phlebotomy?

A. EDTA stands for Ethylenediaminetetraacetic acid. EDTA functions by binding calcium in the blood and keeping the blood from clotting.

Which is the proper technique for performing a venipuncture?

1. Label the tube with the patient's. particulars.
2. Put tourniquet on the patient about. 3-4' above the venipuncture site.
3. Ask patient to form a fist so. veins are more prominent.
4. After finding the vein, clean the. ...
5. Assemble needle and vacuum. ...
6. Insert the collection tube into the. ...
7. Remove cap from needle.
8. Use thumb to draw skin tight.

Why is order of draw important?

Order of draw is essential in avoiding cross contamination from additives of one tube to the next. Cross contamination, depending on the tests ordered, could cause seriously erroneous results, improper patient treatment and possibly death. While most blood collections (straight venipuncture vs.

What are the 3 main veins to draw blood?

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).

When performing a venipuncture for this test you should not use a tourniquet?

Select arm for venipuncture and apply clean tourniquet. A tourniquet is used to increase venous filling and makes the veins more prominent and easier to enter. Never leave the tourniquet on for longer than one (1) minute. To do so may result in either hemoconcentration or a variation in blood test values.

What are the characteristics of a suitable vein for venipuncture?

Of the three veins in the antecubital area acceptable for venipuncture, the median cubital vein (in the middle) is the vein of choice for four reasons: 1) it's more stationary; 2) puncturing it is less painful to the patient; 3) it's usually closer to the surface of the skin; and 4) it isn't nestled among nerves or ...

Why is it important to anchor veins when drawing blood?

Anchor 2 is most important to the phlebotomist during the blood draw. Anchor 2 maintains the device as steady as possible, which allows the phlebotomist to exchange one tube with another without the needle being inadvertently pulled from the arm. This reduces the occurrence of hematomas.

Why basilic vein is the last choice for venipuncture?

The basilic vein is responsible for taking blood that doesn't have oxygen from the arms back to the heart and lungs, where it's given oxygen again. While you can usually see it clearly, it's considered a last resort in medical procedures.

What's the meaning of Venepuncture?

Listen to pronunciation. (VEE-nih-PUNK-cher) A procedure in which a needle is used to take blood from a vein, usually for laboratory testing. Venipuncture may also be done to remove extra red blood cells from the blood, to treat certain blood disorders.

Why is blood drawn from the elbow?

The median cubital vein is used the most for its accessibility. It is large and near the skin's surface, making it easier for phlebotomists to see before anchoring the vein. The median cubital creates less bruising and pain than other draw sites. Within the antecubital fossa, this vein poses the least amount of risk.