What is the normal range of blood test in children?

A routine blood test is the most basic blood examination. Everyone needs to understand the composition of human blood. Human blood mainly consists of two parts, liquid and cells. The cells in the blood mainly include white blood cells and red blood cells. The purpose of a routine blood test is to understand the levels of these cells and thereby determine the disease. So, if it is a young child, what should be the normal range of blood tests?

Normal range of blood test in children:

Red blood cell system: The main function of red blood cells in the human body is to carry oxygen. If the red blood cells, hemoglobin, and hematocrit are all marked with "↓", it indicates the presence of anemia and the tissues may show signs of hypoxia. If "↑" shows an increase in red blood cells in the body, an increase in red blood cells is also abnormal.

White blood cell system: It is abnormal if the white blood cell number shows “↑” or “↓” in the routine blood test. Its total number is within the "normal range". For example, the total white blood cell count of a normal newborn is (9-30) x 109/L, and the average is 20 x 109/L. With the increase of age, the normal value will gradually decrease. For example, for children aged 6 months to 6 years old, it is (6-15)ⅹ109/L, and the average is 10ⅹ109/L; for children aged 7 to 12 years old, it is (4.5-13.5)ⅹ109/L, and the average is 8ⅹ109/L. If the value exceeds the high value, inflammation is suspected, which is mostly bacterial infection. If the value is less than the low value, it may be viral infection or drug effect. The above refers to the total number of white blood cells. We should also further understand that white blood cells are composed of five types of white blood cells, each with its own function. Among them, the largest proportion is neutrophils (represented by the symbol N), accounting for about 50% to 70% (the percentage varies with age), and they mainly play the role of phagocytosis and killing bacteria. The second type is lymphocytes (represented by the symbol L), accounting for about 20% to 40%, which produce cytokines to destroy the bacterial structure and make the bacteria unable to survive. The third type of cell is monocytes (represented by the symbol M), which account for about 1% to 8% and produce antibodies. The fourth type of cell is eosinophil (symbol E), which accounts for about 0.5% to 5%. The proportion may increase when the body is allergic or infected by parasites. The last is the alkaliphilic granulocyte (symbol B), which accounts for about 0-0.75%. If the various proportions are not harmonious, it indicates that there may be some disease.

Platelet system: Platelets (PL) are approximately (100-300) x 109/L. As we all know, the main function of platelets is blood coagulation. Without them, a small wound may put your life in danger. Generally speaking, the platelet count is the third key point that should be paid attention to when observing the test results. If the platelet count is low, the baby may have coagulation problems.