What is the reason for not being able to draw blood

May 12, 2023

Now the blood test is the most common, the hospital's blood routine, blood tests need to draw blood, but the people draw blood is not out, the nurse tied the needle are tied several needles also do not see the blood out, the following look at the blood can not draw out what is the reason?

Blood vessels are too thin

In the blood draw when the blood vessels are too thin needle into the blood vessels, but due to the limited amount of blood in the blood vessels, a small amount of blood can not be drawn out, is the most common phenomenon of not drawing blood, this situation generally occurs in some women with very thin blood vessels, and sometimes the nurse selects the blood vessels are too thin.

Excessive blood fat

Some people are fat, the fat content in the blood is too high, and the syringe for drawing blood is very thin, the viscosity of the blood is too high, the syringe is easily blocked, resulting in the failure to draw blood, such people often need to draw several times to draw enough 10ml.

Too obese

Self too obese, the body's veins are hidden under the thick layer of fat, it is difficult to find the blood vessels, experienced nurses are often first press to find out the vein line, and then to tie the needle, if the nurse is not experienced enough, it is very difficult to tie the blood vessels, also can not draw blood.

Excessive tension

There are many people who are afraid of pain, and some people are blood-sick, these people are especially nervous when drawing blood, the blood vessels in the nervous emotions will be seriously contracted, become very small, the needle is not easy to tie, the blood in the blood vessels is also very limited, if a little can not be drawn out is not tied to the location, if some of the blood can not be drawn out again is the amount of blood is too small, need to change the location to draw again.

Anemia

If you are in a state of anemia, the amount of blood in the blood vessels is very small, the pressure is very low, and the phenomenon of not being able to draw blood can easily occur, often requiring several fist pumping movements to draw 10ml of blood, people in this situation also need to replenish blood as soon as possible after the blood draw, to avoid dizziness, vomiting and other symptoms.

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