capillary resistance test

The Capillary Resistance Test (CRT) is to locally pressurize the arm, block the venous blood flow, load the capillaries, and check the number of new bleeding points within a certain range to estimate the integrity and fragility of the vessel wall. The integrity and fragility of the capillary wall are related to factors such as the structure and function of the capillary wall, the number and quality of platelets, and vWF. When the above factors are defective or the vitamin C and P are deficient, and the blood vessel is damaged by microorganisms or physical factors, the integrity of the capillary wall is destroyed, the brittleness and permeability are increased, and the new bleeding point is increased. Basic Information Specialist classification: skin examination classification: blood examination Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: normal. Positive: A positive result indicates an increase in capillary fragility. Tips: In conjunction with the doctor's examination, patients with faint blood should not look directly at the bleeding point of the skin. Normal value The Rumpel-Leede method is normal for <10 bleeding points (negative) and >10 bleeding points are positive. Clinical significance Abnormal results are positive for this test. (1) Hemorrhage caused by vascular coagulation factors, such as hereditary hemorrhagic telangiectasia, purpura caused by some causes, scurvy, diabetes, high blood pressure, etc. (2) Hemorrhage caused by decreased platelet count or functional defects, such as primary or secondary thrombocytopenic purpura, von Willebrand's disease, thrombocytopenia, and platelet disease. (3) Also seen in liver diseases, chronic nephritis, severe coagulopathy and infectious diseases. The elderly, women, and those with the above-mentioned conditions need to be examined. Positive results may be diseases: allergic purpura matters needing attention Pre-examination contraindications: Ephedrine has the effect of first contraction and expansion of capillaries, and the effect of raising blood pressure. It is a contraindication for the epidemic period of infectious diseases such as epidemic hemorrhagic fever and rickettsial disease that are prone to bleeding. Requirements for examination: In conjunction with the doctor's examination, patients with fainting blood should not look directly at the bleeding point of the skin. Inspection process Inspection method: 4cm in diameter under the elbow bend of the forearm, draw a circle with a diameter of 5cm, use the sphygmomanometer cuff to bundle the upper arm, first measure the blood pressure, and then keep the blood pressure between systolic and diastolic pressure for 8 minutes. , then relieve the pressure, after the skin color returns to normal, count the number of new bleeding points in the skin inside the circle. The normal new bleeding point is below 10. Capillary fragility, allergic purpura, vitamin P or C deficiency, increased capillary fragility, more than 10 new bleeding points, said the beam arm test is positive. Not suitable for the crowd Senile purpura, women with menstrual period, can also be positive by taking large amounts of antiplatelet drugs. Adverse reactions and risks Generally not.

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