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 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 are the main veins used for venipuncture?
1. Median cubital vein A superficial vein, most commonly used for venipuncture, it lies over the cubital fossa and serves as an anastomosis between the cephalic and basilic veins. 2. Cephalic vein Shown in both forearm and arm, it can be followed proximally where it empties into the axillary vein.
What are the 3 methods of venipuncture?
Venipuncture can take place in a general medical practitioner’s office and is often carried out by a trained phlebotomist or nurse.
Three popular methods of blood collection are:
- Arterial Sampling.
- Venipuncture Sampling.
- Fingerstick Sampling.
Why is the cephalic vein used for venipuncture?
Our results confirmed that the cephalic vein at the cubital fossa is a relatively safe venipuncture site because of its distance from the median nerve and brachial artery.
How do I make my veins better for blood draw?
Tips and Tricks for Accessing Problem Veins
- Get warm. When the body is warm, blood flow increases, dilating the veins and making them easier to find and stick. …
- Use gravity. Increase blood flow to your arm and hand by letting gravity do the work. …
- Hydrate. When the body is properly hydrated, veins become more dilated. …
How do you know if a needle is in your vein?
Once you think you’re in a vein, pull the plunger back to see if blood comes into the syringe. If so, and the blood is dark red and slow moving, you know that you’ve hit a vein.
Which site should you avoid for venipuncture?
VENIPUNCTURE SITE SELECTION:
Certain areas are to be avoided when choosing a site: Extensive scars from burns and surgery – it is difficult to puncture the scar tissue and obtain a specimen. The upper extremity on the side of a previous mastectomy – test results may be affected because of lymphedema.
What is the most important step in doing a venipuncture?
Venipuncture is the process of collecting or “draw- ing” blood from a vein and the most common way to collect blood specimens for laboratory testing. It is the most frequent procedure performed by a phle- botomist and the most important step in this proce- dure is patient identification.
Which vein is the last choice for venipuncture?
The basilic vein should be considered only as a final alternative. It is more difficult to access than the other veins of the antecubital area and its proximity to artery, nerves and tendons increases the possibility of injury to the patient. The median cubital and cephalic veins are better choices.
What is the venipuncture technique?
In medicine, venipuncture or venepuncture is the process of obtaining intravenous access for the purpose of venous blood sampling (also called phlebotomy) or intravenous therapy. … In veterinary medicine, the procedure is performed by veterinarians and veterinary technicians.
What is the most common needle gauge for venipuncture?
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 …
What is syringe method in venipuncture?
By using a syringe and needle to draw the patient’s blood, you can control the pressure and speed at which the blood is removed by varying the rate that you pull back on the plunger. A syringe draw is a much more appropriate technique for you to use with veins that easily collapse.
Which is the best vein for venous blood collection?
Relevant Anatomy. The median cubital and cephalic veins are preferred for blood sampling, but other arm and hand veins may be used. The cephalic vein is located on the lateral (radial) side of the arm, and the basilic vein is located on the medial (ulnar) side.
How would you know if you damage a nerve during venipuncture?
sharp shooting pain up or down the arm. sensation of pain that changes in severity depending on needle position. “pins and needles” sensation or an “electric shock” feeling traveling down the arm from the venipuncture site. pain or tingling discomfort in the hand or fingertips.
What happens if you hit an artery during venipuncture?
Hitting an artery can be painful and dangerous. Arterial blood travels away from the heart so whatever is injected goes straight to body limbs and extremities. Injection particles get stuck in blood capillaries and cut off circulation. This can result in a lack of blood flow, eventually causing the tissue to die.