The pressure in the veins is lower than in the arteries, so there is less chance of the blood flowing back through the site where the needle was pierced before the tiny wound heals. Blood taken from an artery is bright red, compared to the darker shade of red seen in the blood from the veins.
Can you draw blood from an artery?
Blood is usually drawn from an artery in the wrist. It may also be drawn from an artery on the inside of the elbow, groin, or other site.
What happens if blood is drawn from an artery?
Collecting blood from an artery typically hurts more than drawing it from a vein. Arteries are deeper than veins, and there are sensitive nerves nearby. You also may feel lightheaded, faint, dizzy, or nauseated while your blood is drawn.
Why do they draw blood from an artery?
An arterial blood sample is collected from an artery, primarily to determine arterial blood gases. Arterial blood sampling should only be performed by health workers for whom the procedure is in the legal scope of practice for their position in their country and who have demonstrated proficiency after formal training.
Why is blood collected from a vein as opposed to an artery?
Located throughout the body, veins return deoxygenated blood to the heart. Veins have valves to prevent backflow of blood and larger lumens (internal spaces) than arteries.
What are the signs of an accidental arterial puncture?
Signs of suspected arterial puncture include noting bright red blood with pulsatile flow, blood column moving upwards in the tubing of an infusion set, intense pain and distal ischaemia.  Confirmation is carried out by blood gas analysis, pressure transducer and ultrasound.
What to do if you puncture an artery?
If arterial puncture occurs, the needle should be removed and pressure applied. If the line has been fully inserted into the artery then bleeding on removal is more problematic as the hole will be that much larger after dilatation.
Can nurses draw ABGS?
Most ABG samples can be drawn by a respiratory technician or specially trained nurse. Collection from the femoral artery, however, is usually performed by a doctor.
How is blood taken from the brachial artery?
Insertion of needle at brachial artery puncture site. Advance the needle slowly. Once the needle enters the lumen of the brachial artery, the arterial blood flow starts to fill the syringe (see the image below). At this point, remove the nondominant hand from the field.
What are the steps of drawing blood?
2.2. 3. Procedure for drawing blood
- Assemble equipment. …
- Identify and prepare the patient. …
- Select the site. …
- Perform hand hygiene and put on gloves. …
- Disinfect the entry site. …
- Take blood. …
- Fill the laboratory sample tubes. …
- Draw samples in the correct order.
What happens when you stick an artery?
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.
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 is the difference between vein and artery?
Veins typically bring oxygen-depleted blood to the heart, while arteries transport oxygenated blood from the heart to the rest of the body.
What is the largest artery in the body?
The aorta is the large artery that carries oxygen-rich blood from the left ventricle of the heart to other parts of the body.
Which vein do we draw blood from?
The median cubital vein is the first choice for blood draws because it has a decreased proximity to arteries and nerves in the arm. The more lateral cephalic vein is the second choice and the basilic vein in the medial arm is the last choice.