blood viscosity

The blood viscosity is the resistance formed by the friction when the two parallel layers of fluid flow are displaced from each other when the blood flows. The determination of it can be a clinical reference for many diseases, especially for the diagnosis and treatment of prethrombotic state and thrombotic diseases. The main factors affecting blood viscosity are: red blood cell aggregation and deformability, hematocrit, size and morphology, blood cholesterol, triglyceride and fibrinogen content. Basic Information Specialist classification: growth and development examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Tips: Do not eat too greasy, high-protein foods the day before, and avoid heavy drinking. The alcohol content in the blood directly affects the test results. After 8 pm on the day before the medical examination, you should fast. Normal value When the cutting speed is 115 (S-1), the viscosity is 5.61 soil 0.85 mPa.s. When the cutting speed is 46 (S-1), the viscosity is 7.3 ± 1.1 mPar.s. When the cutting speed was 11.5 (S-1), the viscosity was 10.4 ± 1.0 mPa·s. Clinical significance Abnormal result Elevated blood viscosity is common in plasma protein abnormal macroglobulinemia, multiple myeloma, congenital hyperfibrinemia, etc.; increased red blood cell count primary or secondary polycythemia, pulmonary heart disease, Leukemia, high altitude environment, long-term hypoxia, etc.; increased red blood cell aggregation leads to increased blood viscosity, myocardial infarction, coronary heart disease, cerebral infarction, diabetes, thromboangiitis obliterans, pulmonary infarction, retinal arteriovenous thrombosis, abnormal hemoglobin disease; Other hyperlipoproteinemia, Raynaud's syndrome, tumors, etc. Reduced blood viscosity may be anemia, hemorrhagic disease, cirrhosis, uremia, acute hepatitis, women's menstruation and pregnancy. The people who need to be examined: weak, pale, and have a sickness. Loss of appetite and weight loss. Easy to bruise or hemorrhage, sore throat, bronchitis with headache, low fever, mouth pain and rash. Lymph nodes, especially in the throat, underarms, and groin. A person who feels uncomfortable under the left flank. High results may be diseases: deep venous thrombosis of lower extremities, lower extremity arteriosclerosis obliterans, pregnancy with polycythemia, pregnancy with essential hypertension, malignant small arterial kidney caused by elderly patients with malignant hypertension Taboo before the test: Do not eat too greasy, high-protein foods the day before the test, to avoid heavy drinking. The alcohol content in the blood directly affects the test results. After 8 pm on the day before the medical examination, you should fast. Requirements for examination: When taking blood, you should relax your mind to avoid the contraction of blood vessels caused by fear and increase the difficulty of blood collection. Inspection process Rotary viscosity measurement method: The principle of measuring viscosity is an object that can actively rotate at different rotation speeds, passively rotates and generates a certain amount of force by acting on the liquid to be measured and driving another object coaxial with it. Resistance, as long as you know the geometry of the active rotating object, the rotational speed and the force distance generated by the passive rotating object, you can calculate the shear stress and the shear rate of the measured liquid, using the formula η = τ / γ Then, the viscosity of the liquid to be tested can be calculated (where η is the viscosity, τ is the shear stress, and γ is the shear rate). A viscometer manufactured using this principle is a rotational viscometer. Currently used are cone and plate viscometers and drum viscometers. The main structure of this type of viscometer is a rotating drum or disc and a concentric inner drum or cone. The narrow gap between the two is the liquid sample to be tested, and the inner drum or cone is metal twisted. Silk K is suspended. The biggest advantage of this type of viscometer is that the shear rate can be changed by changing the rotational speed, and the viscosity of the liquid at a wide range of shear rates (0.04-4000 S-1) can be measured. In addition, the gap between the two rotating objects is small, so few liquid samples can be measured and have high precision, especially suitable for the measurement of whole blood viscosity. Not suitable for the crowd 1. Patients who have taken contraceptives, thyroid hormones, steroid hormones, etc., may affect the results of the examination and prohibit patients who have recently taken the drug history. 2, special diseases: patients with hematopoietic function to reduce disease, such as leukemia, various anemia, myelodysplastic syndrome, etc., unless the examination is essential, try to draw less blood. Adverse reactions and risks 1, subcutaneous hemorrhage: due to pressing time less than 5 minutes or blood draw technology is not enough, etc. can cause subcutaneous bleeding. 2, discomfort: the puncture site may appear pain, swelling, tenderness, subcutaneous ecchymosis visible to the naked eye. 3, dizzy or fainting: in the blood draw, due to emotional overstress, fear, reflex caused by vagus nerve excitement, blood pressure decreased, etc. caused by insufficient blood supply to the brain caused by fainting or dizziness. 4. Risk of infection: If you use an unclean needle, you may be at risk of infection.