How to take blood from a vein

With complicated forms of various diseases, more accurate diagnosis and identification of the causes of their appearance may require blood from the vein in an amount of up to 10 ml. The results of the research depend on the quality of the procedure for taking blood.

If a laboratory assistant can take the capillary blood , the blood sampling from the vein should be performed by a qualified nurse in a sterile procedural room using a special instrument.

It is important that the patient is prepared to donate blood, as there are a number of factors that can adversely affect the result of the study. Should avoid physical overstrain before the procedure (fast walking, running, climbing the stairs), refuse to eat before research, do not smoke and do not drink alcohol, keep emotional calm.

Before taking blood from the vein, the medical staff is obliged to provide the patient with a 15-minute rest. Immediately during the procedure, the patient should sit, and the seriously ill patient may lie. If the patient used food, smoked or drank alcoholic drinks, the delivery of tests can be postponed to a different date.

It is most convenient to take blood from the veins of the forearm, as here they are located on the surface and are clearly visible. Here, the following veins can be used: external superficial, ulnar, medial superficial, radial, median vein of the elbow, internal surface.

The veins are differently fixed in the tissues of the body, so the blood is best taken from less moving vessels, since they are more convenient for piercing with a needle. These blood vessels include the median vein of the elbow and the outer surface of the elbow.

In the absence of a full-fledged experience, taking blood should not be done from the inner superficial vein, since next to it is a worm and an artery. An inaccurate injection can be harmful to the patient.

If the veins of the ulnar fold are not visible enough (for example, in obese people), it is possible to draw blood from the venous vessels of the back surface of the hands, as well as the popliteal cavity.

Infants take blood from the veins located on the temples. When the child screams, they swell significantly, which makes it safer to make a puncture with a needle. Also, blood from the vein can be taken from the child's heel.

It should be avoided taking a fence in the places of scars, hematomas, from venous vessels used for transfusion of medical solutions. In patients with diabetes, with violation of peripheral blood flow, angiopathy, do not take blood from the leg veins.

The procedure is carried out in disposable rubber gloves. Otherwise, gloves should be pre-treated with medical alcohol.

For the collection of blood from the vein, the following instruments and accessories are used: vacuumers (disposable plastic blood sampling systems), disposable syringes and needles with a cross-sectional diameter of 0.55-0.65 mm, an elastic tourniquet, a test tube, sterile rubber gloves, cotton balls, Alcohol.

Taking blood from the vein is as follows:

A tourniquet is placed on the middle third of the shoulder to stop the blood flow.

The place of the elbow fold is treated successively with two balls of cotton wool, previously moistened with alcohol. The patient at this time clenches and unclench the fist.

The most complete vein is found and fixed by stretching the skin. The patient should squeeze his hand into a fist.

Firmly holding the tip of the needle with a cut up and parallel to the skin, it is necessary to pierce the vein and carefully, along the vessel, insert the needle a third of the length.

To the cannula of the needle, substitute the tube and release the blood in the right amount.

Remove the harness. The patient should unclench the fist.

The needle is removed, and the puncture site is covered with a cotton ball.

The patient should bend at the elbow joint arm, to press the vein until the bleeding stops.

To the tube, which contains blood from the vein, you need to attach the direction.