hematocrit

Hematocrit refers to the percentage of red blood cells in the volume of whole blood. It reflects the ratio of red blood cells to plasma. People who need to be examined have people who are pale, accompanied by symptoms such as dizziness, fatigue, palpitations, and shortness of breath. Basic Information Specialist classification: growth and development examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Analysis results: Below normal: Reduce the incidence of anemia or pregnancy. Normal value: Male: 40-50vol% Female: 37-48vol% Newborn: 49-60vol% Above normal: Increased in polycythemia vera. negative: Positive: Tips: After 8 pm on the day before the medical examination, you should start fasting for 12 hours, so as not to affect the test results. Normal value Blood cell automatic analyzer: Male 0.40 to 0.50 (40 to 50 vol%). Females are 0.37 to 0.48 (37 to 48 vol%). The newborn is 0.49 to 0.60 (49 to 60 vol%). Clinical significance Abnormal results: Increase: 1 severe dehydration (large amount of vomiting, diarrhea, loss of water, etc.). 2 large area burns. 3 true polycythemia. 4 secondary polycythemia (neonatal, high altitude disease, severe pulmonary heart disease, etc.). reduce: 1 anemia or pregnancy azoemia. 2 secondary fibrinolysis. 3 epidemic hemorrhagic fever complicated by high blood volume syndrome. 4 pregnancy-induced hypertension. People who need to be examined have people who are pale, accompanied by symptoms such as dizziness, fatigue, palpitations, and shortness of breath. The result is low, the disease may be: the gastric ulcer has a high blood pressure, and the disease may be a disease: the mesenteric artery embolization precautions Before inspection: 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 medical examination, you should start fasting for 12 hours to avoid affecting the test results. 3, should relax when taking blood, to avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection. After inspection: 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. Inspection method: After the blood is exhausted, the blood which has been mixed with a small amount of anticoagulant is filled into a special, graduated specific volume tube and centrifuged at 3000 rpm for half an hour. The blood components are different according to gravity. Layered, the upper layer of pale yellow liquid is plasma, the lower layer of opaque dark red thrombus is red blood cells, and a thin layer of white film between red blood cells and plasma is white blood cells and platelets, accounting for about 1%. At this time, red blood cells account for the percentage of whole blood volume. For hematocrit. Not suitable for the crowd Have a coagulopathy such as hemophilia. Adverse reactions and risks Bleeding: After blood collection, use sterile cotton lump or other disinfecting hemostatic articles to tighten the needle to stop bleeding, especially for patients with coagulopathy should be given sufficient time to avoid bleeding.