Hematocrit (PCV)

Hematocrit (PCV) refers to the volume of red blood cells per liter of blood. Basic Information Specialist classification: cardiovascular examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Analysis results: Below normal: Reduced in various anemias, cancers and septicemia. Normal value: Male: 40-50% Female: 37-48% Above normal: Increased in dehydration, acute myocardial infarction and polycythemia. negative: Positive: Tips: After 8 pm on the day before the medical examination, you should fast, so as not to affect the detection of indicators such as blood glucose in the second sky. Normal value Males range from 0.40 to 0.50 (40% to 50%) with an average of 0.45. Females ranged from 0.37 to 0.48 (37% to 48%) with an average of 0.40. Clinical significance Abnormal results are seen in a variety of anemia, cancer and septicemia. Increased in dehydration, acute myocardial infarction and polycythemia. People who need to be examined have symptoms of anemia, such as pale, accompanied by dizziness, fatigue, palpitations, and shortness of breath. Low results may be diseases: megaloblastic anemia results are high. Possible diseases: precautions for acute myocardial infarction First, the precautions before blood draw: 1, do not eat too greasy, high-protein food the day before the blood, to avoid heavy drinking. The alcohol content in the blood directly affects the test results. 2. After 8 pm on the day before the physical examination, fasting should be done to avoid affecting the detection of indicators such as blood glucose in the second sky. 3, when drawing blood: should relax the mood, avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection. Patients with a history of fainting should explain in advance and we will make special arrangements. Second, after blood draw should pay attention to: 1. After blood is drawn, local compression is required at the pinhole for 3-5 minutes to stop bleeding. Note: Do not rub, so as not to cause subcutaneous hematoma. 2, the pressing time should be sufficient. There is a difference in clotting time for each person, and some people need a little longer to clotting. Therefore, when the surface of the skin appears to be bleeding, the compression is stopped immediately, and the blood may be infiltrated into the skin due to incomplete hemostasis. Therefore, the compression time is longer to completely stop bleeding. If there is a tendency to bleed, the compression time should be extended. 3, after the blood draw symptoms of fainting such as: dizziness, vertigo, fatigue, etc. should immediately lie down, drink a small amount of syrup, and then undergo a physical examination after the symptoms are relieved. 4. If there is localized congestion, use a warm towel after 24 hours to promote absorption. 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. After the blood is drawn, the doctor performs a red blood cell comparison test. Not suitable for the crowd Hemophilia and diffuse intravascular coagulation. Adverse reactions and risks Discomfort: There may be pain, swelling, tenderness, and visible subcutaneous ecchymosis at the puncture site.