Introduction: Blood, the source of life, plays a vital role in the human body, it is like the vein of life, nourishing every corner of the body, providing necessary nutrients and oxygen for various organs and tissues.
At the same time, it is also physical"Sirens"As soon as there is an abnormality in the body, the composition of the blood changes, warning us.
When a lesion occurs in one of the organs or tissues of the human body, the lesion leaves traces in the components of the blood. For example, when liver function is impaired, blood levels of aminotransferases may be elevated; In diabetic patients, blood sugar is elevated, and abnormal changes in blood glucose concentration are also reflected in the results of blood tests.
These changes are like those of the body"Password"By deciphering these codes, the doctor can roughly determine the location and extent of the lesion.
The composition of blood is a complex and miraculous process, which is essential for maintaining the body's vital activities, and blood is mainly composed of plasma, red blood cells, and white blood cells.
Plasma is the main body of blood, which contains a lot of water and some low-molecular substances, such as proteins, sugars, fats, and inorganic salts.
Red blood cells are responsible for transporting oxygen and nutrients, while white blood cells act as an immune agent that helps the body fight off various pathogens.
In addition to these main components, blood also contains platelets, clotting factors, and other components, which play an important role in the process of hemostasis and coagulation.
The various components of the blood play different roles in the human body, and they cooperate with each other to maintain the vital activities of the human body.
It is important to note that the composition of blood is not static, it can be affected by many factors, such as diet, environment, lifestyle habits, and diseases, etc.
Therefore, understanding the composition of blood and its function is of great significance for the prevention and development of various blood-related diseases.
When we see a doctor, the doctor may recommend a variety of tests, this is because the test can provide the doctor with more information, help the doctor to make the correct diagnosis and make a plan, here are some of the common reasons:
Confirm the diagnosis
Some symptoms may not be specific, and multiple disorders may cause similar symptoms, and through testing, doctors can rule out some possible disorders, narrow down the diagnosis, and finally determine the correct diagnosis.
Assess the severity of the disease
The examination can provide detailed information about the disease, such as the degree of progression of the disease, the degree of impairment of organ function, etc., which helps the doctor to assess the severity of the disease and formulate the corresponding plan.
Monitor the effect
In the process of carrying out the disease, the doctor needs to monitor the progress and effect of the disease, and through regular examinations, the effect can be evaluated and the plan can be adjusted in time.
Prevention and screening
Some diseases have no obvious symptoms in the early stage, and the existence or potential risk of the disease can be detected early through regular examinations, and corresponding preventive or ** measures can be taken.
Reference data is provided
The results of the examination can provide some physiological indicators or reference data that can help doctors judge the patient's health, diagnose diseases, or provide guidance**.
It should be noted that the doctor will reasonably select the examination items according to the specific situation and avoid excessive examination. At the same time, patients can also fully communicate with their doctors, understand the purpose, process and possible risks of the examination, and make informed decisions.
Anemia
By checking the red blood cell count (RBC), hemoglobin (HB), and mean red blood cell (MCV, etc.), the type and severity of anemia can be assessed, and the cause of anemia can be determined, such as iron deficiency anemia, megaloblastic anemia, etc.
Infection
White blood cell count (WBC) and differential count (eg, neutrophils, lymphocytes, monocytes, etc.) can help detect the presence and severity of infection, and an elevated white blood cell count may indicate a pathogen infection.
Inflammation
Erythrocyte sedimentation rate and C-reactive protein (CRP) are measures of inflammation and can be used to assess the degree of inflammation and progression of the disease.
Coagulation disorders
Indicators such as platelet count (PLT) and prothrombin time (PT) can help assess blood clotting and detect coagulation abnormalities and risk of thrombosis.
Leukemia and bone marrow disorders
Abnormal white blood cell count, morphology, and differential counts in the blood can indicate the presence of hematologic diseases, such as leukemia and myelodysplastic syndrome.
Routine blood examination is an indispensable detection method in the medical field, and through the in-depth interpretation of its various indicators, it can comprehensively understand the health status of the examinee.
This test uses precision instruments to count and classify different types of cells in the blood, revealing various physiological or pathological changes in the body.
If the blood test report shows that three key indicators are elevated, it usually means that the body may be facing some kind of potential health threat, and these indicators are like "alarms" inside the body, and once they sound, we must pay enough attention:
Increased red blood cell count
The red blood cell count is an important indicator of the amount of red blood cells in the blood, and if the red blood cell count is elevated, it is necessary to be vigilant as it may indicate some underlying health problems. Elevated red blood cell count can be caused by dehydration, when the body is dehydrated, in order to maintain normal blood circulation, the body secretes more erythropoietin, which prompts the bone marrow to produce more red blood cells, this condition is usually relieved by timely hydration, but if it persists for a long time, it may cause a burden on organs such as the kidneys. Secondly, the elevated red blood cell count may also be caused by lung diseases, some lung diseases such as chronic obstructive pulmonary disease, emphysema, etc., can lead to a lack of oxygen in the body, which stimulates the bone marrow to produce more red blood cells, which requires timely lung disease to avoid greater impact on physical health. 
Increased platelet count
As a common medical examination item, blood routine examination is of great significance for assessing human health status, and platelet count is an important indicator in blood routine examination, and the change of its value is of guiding significance for diagnosis and disease.
When the platelet count is elevated, it may indicate some potential health problems, platelets play an important role in hemostasis in the human body, participate in blood clotting, so a high platelet count may increase the risk of thrombosis, which can lead to cardiovascular disease, cerebral thrombosis and other serious consequences.
In addition, some malignant tumors such as myelodysplastic syndrome, chronic myeloid leukemia, etc., can also cause an elevated platelet count.
The total number and proportion of lymphocytes are markedly elevated
The total number and proportion of lymphocytes is an important indicator in the routine blood test, and if this indicator is elevated, it is necessary to be alarmed, as it may indicate some potential health problems. Normally, the number of lymphocytes should be greater than 5 10 l. If the total number and proportion of lymphocytes are significantly elevated during a routine blood test, it may mean that the patient's body is suffering from chronic lymphocytic leukemia.
Chronic lymphocytic leukemia is a common type of leukemia, which is characterized by abnormal proliferation of lymphocytes in the body and may pose a threat to the patient's life, so when the results of routine blood tests show that the total number and proportion of lymphocytes are abnormally high, both patients and doctors should pay close attention.
Although routine blood tests have a certain reference value for the early detection of some cancers, they cannot be completely relied on to diagnose cancer.
Indicators in the blood routine include red blood cells, white blood cells, and platelets, and changes in these indicators may be associated with certain cancers. For example, an abnormally elevated white blood cell count may indicate a hematologic malignancy such as leukemia; Thrombocytopenia may indicate a hematologic disorder such as myelodysplastic syndrome. In addition, certain cancers such as lung cancer and gastric cancer may also cause abnormalities in blood routine indicators.
However, the limitation of routine blood test is that its sensitivity and specificity are relatively low, and even if the routine blood test results are abnormal, it cannot be directly identified as cancer, and a comprehensive judgment needs to be made in combination with other test results and clinical manifestations.
At the same time, some cancers may not have obvious abnormalities in the early stage of the blood routine, so the blood routine alone cannot be relied on to detect early cancers.
Diet
The diet on the day before the routine blood test should be as light as possible, avoiding too greasy, high-protein, high-fat food, so as not to affect the results of the test, it is recommended to avoid alcohol the day before the test, because alcohol may affect the blood routine index.
Medications
If you have a chronic disease, such as high blood pressure, diabetes, etc., and need to take medication for a long time, it is recommended not to take these medications on the morning of the examination so as not to affect the test results, and if you must take medication, you can consult your doctor if you need to stop taking it.
Rest
It is recommended to take enough sleep the night before the blood routine examination, avoid strenuous exercise and emotional agitation, so as not to affect the results of the examination, and it is recommended to ensure sufficient sleep time the night before the examination.
Avoid blood thinning
Avoid drinking large amounts of water or fluids before performing a routine blood test, as this can lead to blood thinning, affecting the results of the test, and if you are thirsty or need to drink water, you can drink a small amount, but not in excess.
Wear
When conducting routine blood examination, comfortable and convenient clothes should be worn to facilitate the doctor's blood collection operation, and it is recommended not to wear clothes that are too tight or have too small cuffs, so as not to affect blood circulation and blood collection effect.
High blood pressure
High blood pressure does not necessarily mean that you have high blood pressure. Physiological factors such as emotional stress, anxiety, stress, or insomnia can also cause a temporary increase in blood pressure. If high blood pressure is found, multiple measurements are recommended to confirm the diagnosis.
High aminotransferases
Transaminases are sensitive indicators of liver function, but elevated aminotransferases do not necessarily indicate liver disease, as strenuous exercise, alcohol consumption, certain medications, or excessive fatigue can cause transient elevations and require further testing if they remain elevated.
Abnormal protein in the urine
Abnormal protein in urine may be a sign of kidney disease, but it can also be caused by physiological reasons, such as strenuous exercise, high-protein diet, etc., and a single abnormal protein in urine cannot confirm the diagnosis of kidney disease, and multiple tests and evaluations are required.
Nodules in the lungs
A lung nodule does not necessarily mean you have lung cancer. Benign lesions, inflammation, tuberculosis, etc. may lead to the appearance of lung nodules, and pulmonary nodules found in physical examination need to be followed up and observed regularly, and if there is any change, timely treatment.