Beam arm test

The capillary resistance test (CRT) is to apply local pressure to the arm to block venous blood flow, load the capillaries, and check the number of newly emerging 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 the structure and function of the capillary wall, the number and quality of platelets, and vWF. When the above factors are defective or vitamin C and P deficiency, and the blood vessels are damaged by microorganisms or physical factors, the integrity of the capillary wall is destroyed, making it more brittle and more permeable, and increasing the number of new bleeding points.