Why does a doctor always call for a blood test every time he goes to the hospital?

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What's in the blood?

Blood is a red, opaque, viscous liquid that flows through human blood vessels and hearts.

Blood consists of plasma and blood cells. Blood cells are the collective name of red blood cells, white blood cells and platelets (see figure below).

Blood routine is actually to check whether the number of red blood cells, white blood cells and platelets increases or decreases abnormally, and whether their morphology changes abnormally.

So to understand the report, first of all, we need to understand the biological functions of these three types of cells.



Red blood cells contain an important protein called hemoglobin, which is regulated by iron and can bind to oxygen. Therefore, the important function of hemoglobin is to transport oxygen to all parts of the body.

If the number of red blood cells in the blood decreases, or the structure is distorted, it will affect the ability of hemoglobin to transport oxygen. The ability of blood to transport oxygen is reduced, naturally the whole person is not good, dizziness, blindness is also a common thing.

In addition, hemoglobin should be regulated with iron to carry oxygen everywhere. Without iron, hemoglobin will strike. We call this phenomenon iron deficiency anemia.

If you look at it carefully, people with anemia generally have a poor improvement and a whiter complexion, which is caused by too few red blood cells. Hemoglobin is red. There are a lot of red blood cells in the blood. All the blood turns red.




Leukocyte is the immune cell of human body. It specializes in viruses, bacteria and parasites, so it is called "guardian of home". When the human body is attacked by the above three pathogens, the white blood cells in the blood will increase and the attackers will be encircled and suppressed.

When scientists studied white blood cells, they found that there were two types of white blood cells: granular and non-granular. There are three kinds of granular white blood cells: neutrophils, eosinophils and basophils. There are two kinds of granular white blood cells: monocytes and lymphocytes. (See the chart below for classification in seconds)

(3) Platelet

Platelet is the body's bandage, where there are wounds, where there is its shadow.

The main functions of platelets are hemostasis and coagulation. When a person is injured, the blood vessel ruptures, and platelets gather here, forming a thrombus to block the fissure.

In addition, it also releases substances that promote blood coagulation and accelerate blood clotting. Moreover, in order to reduce blood loss, platelets also release substances to tighten blood vessels.

Source: www.Desheng Technology. China