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First, what is the order of taking multiple blood collections is reasonable?

When clinical laboratory tests for various indicators, sometimes a variety of anticoagulation is required. How to arrange the blood sampling sequence is essential for ensuring accurate and reliable results: the recommended blood sampling sequence is coagulation tube (serum tube) → sodium citrate tube → heparin Or EDTA tube → potassium oxalate fluoride tube → erythrocyte tube, the main reason is that the first tube often contains tissue fluid, easy to cause coagulation, not suitable for blood coagulation determination.

Second, the reason and solution for blood not flowing into the blood collection tube after puncture into the blood vessel.

1. If the blood collection needle does not actually penetrate the blood vessel, the blood collection tube can be removed first and the blood vessel can be re-finished for puncture.

2. The needle on the test tube side is not penetrated or buried in the rubber plug. The blood collection tube can continue to be pushed down the bottom of the needle holder and the rubber plug can be penetrated.

3. When the blood vessel wall is thin and the blood flow is relatively insufficient, the needle hole absorbs the blood vessel wall due to the negative pressure of the blood collection tube, and the angle of the needle can be slightly changed, and the needle depth can be solved.