Why do you have to have a blood test when you go to the hospital?

We may find a very strange phenomenon, that is, no matter what illness, we have to go to the hospital, and the doctor will suggest a blood test. Many people are puzzled. Why do we sometimes need blood tests just to cough or have a fever? There is no blood disease, so what's the use of drawing blood? But in fact, this kind of blood test is called routine blood test in medicine, and all kinds of data in the blood can clearly and intuitively see whether our body is abnormal. Blood exists in all parts of our body, so we can see whether our body is in a healthy state through routine blood examination.

Blood routine report can directly see whether the body is abnormal. Generally, there will be a test report after the blood test. There will be different values in this report, and an up or down arrow will be marked. If there is no target, it proves that the value is normal. If the mark is up, it proves that the value exceeds the normal value. If the arrow is down, it proves that the value is low. Among these tests, the most important ones are hemoglobin, white blood cells and platelets. If these values are deviated, it proves that the body is abnormal and needs symptomatic treatment.

The exception of each value is also different. Whether the hemoglobin value is normal can effectively reflect whether you are in dehydration anemia or lung disease. If the hemoglobin value is low, it means that the body is in an anemia state. If the hemoglobin value is high, it means that the body is dehydrated and the lungs may be abnormal. Whether the platelet value is normal is also important. Perhaps many people know that platelets mainly play a role in coagulation in our body. For example, our bodies are accidentally injured and bleeding. If the platelet value is normal, the blood can be quickly coagulated and the wound can stop bleeding. Low platelet value means abnormal coagulation function, while high platelet value means that the body may suffer from leukemia and other blood diseases.

Including the blood routine examination when you usually have a cold and cough, you can also see whether the fever and cough are caused by bacterial infection or virus infection through whether the white blood cell value is abnormal, and the treatment methods for diseases caused by different reasons are also different.