mean corpuscular volume (MCV)

The mean red blood cell volume (MCV) is the average volume of a single red blood cell in a human body and is usually calculated indirectly. A clinically convenient formula is the mean red blood cell volume (fL) = HCT / RBC x 100. Drug effects: 1 elevated drugs that can cause megaloblastic anemia are barbiturates, phenobarbital (folate metabolism disorders), glutamine, phenytoin, phenacetin (occasionally), anthranil Pyridine, estrogen, phenformin (deficient folate or vitamin B12), furans, neomycin, isoniazid, cycloserine, aminobenzoic acid (caused by digestive tract malabsorption), aminosalicylic acid, A Ampicillin, colchicine (with vitamin B12 deficiency), of which anticonvulsant drugs increased by about 3%. 2 lowering the dicoumarin ethyl ester can cause small cell hypochromic anemia. Basic Information Specialist classification: cardiovascular examination classification: blood examination Applicable gender: whether men and women apply fasting: not fasting Tips: Do not eat too greasy, high-protein foods the day before the blood draw, avoid heavy drinking. Normal value 80 ~ 94fL. Clinical significance Abnormal results: (1) Volume increase is seen in large cell anemia. (2) Volume reduction is seen in small cell hypochromic anemia. Physiological changes: 1 raises the newborn by about 12%, pregnancy about 5%, drinking about 4%, smoking about 3%, and oral contraceptives about 1%. 2 Reduce the intense muscle activity by about 4%, and reduce the child by about 10% 6 months ago. Drug effects: 1 elevated drugs that can cause megaloblastic anemia are barbiturates, phenobarbital (folate metabolism disorders), glutamine, phenytoin, phenacetin (occasionally), ampicillin, female Hormone, phenformin (deficient for folate or vitamin B12), furan, neomycin, isoniazid, cycloserine, aminobenzoic acid (caused by induced digestive tract malabsorption), aminosalicylic acid, methotrexate , colchicine (with vitamin B12 deficiency), of which anti-convulsant drugs increased by about 3%. 2 lowering the dicoumarin ethyl ester can cause small cell hypochromic anemia. Pathological changes: 1 elevated in dystrophic megaloblastic anemia (nutrition, malabsorption, post-gastrectomy, intestinal disease, mites and other parasitic diseases, and pernicious anemia, mixed deficiency, folic acid, vitamin B12 deficiency, genetic causes ), alcoholic cirrhosis, extra-pancreatic insufficiency, acquired hemolytic anemia, hemorrhagic anemia after regeneration and hypothyroidism. 2 reduced in small cell hypopigmentation anemia (secondary anemia caused by cancer or infection, hyperironemia seen in iron erythrocyte anemia and lead poisoning and CO poisoning), systemic hemolytic anemia (thalassemia, hereditary spheroid Hyperplasia, congenital pyruvate kinase deficiency). The people who need to be examined have people with symptoms such as high cold, shortness of breath, fatigue, fever, and palpitations. High results may be diseases: hemoglobin E disease, hemoglobin M disease considerations 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 medical examination, you should fast. 3, should relax when taking blood, to avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection. 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, and then the doctor performs calculation and examination. Not suitable for the crowd Have a coagulopathy such as hemophilia. Adverse reactions and risks Infection: Do not touch the dirt after blood collection. Do not wash your hands immediately to avoid infection.