Standard blood test method for platelet donation

If you donate platelets, you should pay attention to the standards and examinations for routine blood tests, because only if you meet the standards can you donate platelets. If you want to know whether you meet the standards, you should also pay attention to the methods of routine platelet and blood tests.

Blood routine examination process:

Venous blood sampling usually uses superficial veins located on the body surface, usually the elbow vein, the back of the hand vein, the medial ankle vein or the femoral vein. The antecubital vein is the preferred blood collection site for most people (except infants and young children). The blood vessels here are generally more obvious, the pain is lighter, and the operation is convenient and easy. In children, blood can be drawn from the external jugular vein. The femoral vein is selected next.

【method】

1. Prepare all the necessary materials, label the specimen containers, and explain to the patient after checking that they are correct to gain cooperation. Expose the patient's arm, select a vein, tie a tourniquet about 4 to 6 cm above the venous puncture site, and ask the patient to clench his fist to make the vein full and visible.

2. Disinfect the skin routinely and wait for it to dry.

3. Below the puncture site, use the left thumb to tighten the skin and fix the vein. Hold the syringe in the right hand with the needle bevel upward at an angle of 15 to 30 degrees to the skin. Pierce the subcutaneous tissue above or beside the vein, and then sneak into the vein along the direction of the vein. After seeing the blood return, slightly flatten the needle, move it forward slightly and fix it still. When the required amount of blood is drawn, loosen the tourniquet, ask the patient to relax his fist, press the puncture point with a dry cotton swab, quickly pull out the needle, and flex the patient's forearm for a moment.

4. Remove the needle and slowly inject the blood into the container along the tube wall. Do not inject foam to avoid hemolysis. When glass beads are placed in the container, it should be shaken quickly to remove fibrinogen; if it is an anticoagulant test tube, it should be rotated and rubbed in both hands to prevent coagulation; if it is a dry test tube, it should not be shaken; if it is a liquid culture medium, the blood and culture fluid should be mixed evenly, and the bottle mouth should be disinfected with flame before and after the blood is injected into the culture bottle, and be careful not to let the bottle stopper contact the blood.

The amount of blood drawn is determined by the content of the test and the number of items, usually around 5 ml.