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The method of collecting blood samples in the ear edge vein
Firstly, selected the ear vein and then removed the hair, clamping the root of the ear using a small vascular clip what could make venous dilatation. The experimenters held a thick needle from blood vessel of the tip ear into the vein to take blood, along the direction of the reverse flow, or cut veins with a scalpel, then blood flowed out. Collected 2-3 ml blood samples and pressed the wound with cotton balls to stop the bleeding. By pressing the collateral vein, the blood could flow out faster. Before collected the blood samples, rubbing liquid paraffin on the ear, what could prevent blood coagulation.

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