Red blood cell count (RBC)

Red blood cell count refers to the number of red blood cells contained in a unit volume of blood, which is important for diseases that are involved in the red blood cell system. Under normal circumstances, the formation and destruction of red blood cells are in a dynamic equilibrium, so the quantity and quality of red blood cells in the blood remain relatively stable. Disorders of erythropoiesis and destruction, regardless of the cause, can cause changes in the quantity or quality of red blood cells, leading to disease. Basic Information Specialist classification: cardiovascular examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Tips: You should fast after 8 pm on the day before the medical examination. Normal value Male (4.0 to 5.5) × 1012 / L. Female (3.5 ~ 5.0) × 1012 / L. Newborn (6.0 ~ 7.0) × 1012 / L. Clinical significance Abnormal results: increase: (1) Patients with severe vomiting, diarrhea, extensive burns, and advanced gastrointestinal cancer. Mostly, the concentration of dehydrated blood causes a relatively large increase in the formation of blood. (2) Cardiopulmonary diseases, congenital heart disease, chronic lung disease and chronic carbon monoxide poisoning. Due to lack of oxygen, a large number of red blood cells must be used to maintain oxygen supply. (3) Stem cell disease with polycythemia vera. cut back: (1) Acute or chronic blood loss. (2) Red blood cells are damaged by physical, chemical or biological factors. (3) Lack of hematopoietic factors, hematopoietic disorders, and hematopoietic tissue damage. (4) Intravascular or extravascular hemolysis for various reasons. The people who need to be examined have people with symptoms of heart failure, cyanosis, clubbing (toe) and polycythemia, pulmonary hypertension, and developmental disorders. Precautions An increase in the count amount can relatively reduce the error. The red blood cell count decreased from 5 pm to 7 am and after meals, up to 10%. Bed rest can be reduced by 5.7% compared with normal activities. Therefore, time, diet and time should be properly considered when evaluating two blood test results. Bed rest and other factors. Red blood cell counts are highly prone to errors. Venous blood collection, long-term ligation of the tourniquet can cause false increase, the pipette is unclean, not accurate, will count or increase or decrease; draw the diluent, now use a manual dosing device, the capacity should be calibrated before use; Try to buy the exact one; count enough when counting. If you pay attention to it, the results obtained by the manual method still have good accuracy and can be used to correct the automatic counter. Inspection process The examination process: blood is drawn, blood is taken for examination, and venous blood is generally taken, and blood is drawn by a doctor or a nurse. The amount of blood drawn is determined according to the difference of the test content and the number of items. The blood volume is usually 2-20 ml, and the maximum is not more than 50 ml, and then the doctor performs calculation and examination. Not suitable for the crowd Hemophilia and diffuse intravascular coagulation. Adverse reactions and risks Dizziness or fainting: When blood is drawn, due to emotional overstress, fear, reflex caused by vagus nerve excitability, blood pressure drop, etc., the blood supply to the brain is insufficient to cause fainting or dizziness.