What can a routine blood test detect?

Routine blood test is the most basic blood test item. It helps doctors to initially judge health status by analyzing the number, shape and proportion of various cells in the blood. It can screen for anemia, infection, inflammation, blood diseases and other problems, but it cannot diagnose specific diseases and needs to be combined with other tests for further analysis. The main content includes three major categories of indicators: red blood cells, white blood cells, and platelets. Abnormalities in each indicator may correspond to different health risks.

The significance of red blood cell related indicators

Red blood cell parameters (eg, hemoglobin, hematocrit) can reflect anemia or polycythemia. For example, hemoglobin lower than normal may indicate iron deficiency anemia, which needs to be confirmed by serum iron testing; while abnormally increased red blood cells may be related to chronic hypoxia or myeloproliferative diseases. Additionally, mean corpuscular volume (MCV) can help differentiate between types of anemia, such as microcytic anemia (iron deficiency) versus macrocytic anemia (vitamin B12 deficiency).

The clinical value of white blood cell classification

The total number and classification of white blood cells (neutrophils, lymphocytes, etc.) are crucial to determining the type of infection. Elevated neutrophils are common in bacterial infections, while increased lymphocytes may indicate viral infection or immune abnormalities. Eosinophilia may be associated with allergies or parasitic infections. In addition, an extreme increase in white blood cells or the appearance of immature cells should alert you to leukemia, and further diagnosis needs to be made through bone marrow puncture.

Correlation between platelets and other indicators

Low platelets may lead to bleeding tendencies, often in immune thrombocytopenia or bone marrow problems, while high platelets may increase the risk of blood clots. If red blood cell and white blood cell abnormalities are combined at the same time, diseases such as aplastic anemia or myelofibrosis need to be considered. Some drugs (such as chemotherapy drugs) will also affect platelet values ​​and need to be analyzed together with the medication history.

Summary and Notes

Routine blood tests are the "first line of defense" for health screening, but the results need to be comprehensively judged by a doctor based on symptoms and other examinations. For example, mild abnormalities may be caused by dehydration, exercise and other physiological factors, so there is no need to worry too much. Commonly used routine blood testing equipment manufacturers include Sysmex, Mindray, etc., with products such as Sysmex XN series, Mindray BC-6800, etc. If the results continue to be abnormal, further biochemical, bone marrow biopsy and other examinations are recommended.

Cited sources: 1. "Diagnostics" (People's Medical Publishing House, 9th edition) 2. "Clinical Operation Guidelines for Routine Blood Routine" by the Hematology Branch of the Chinese Medical Association 3. Sysmex official website (www.sysmex.com.cn) 4. Mindray Medical official website (www.mindray.com)