What is the reason for the water droplets in the evacuated blood collection tube?

 

When it comes to blood test, many people are familiar with it. For example, common liver and kidney function tests, immune function tests, etc. need to detect the amount of blood, so that doctors can more accurately determine whether they have a disease. In the process of blood drawing, you may see that the windows are filled with various tubes, and some test tubes have water droplets on the inner wall, which makes people wonder whether they have been washed and reused? What the hell is going on? Now let's take you to analyze how the water droplets on the inner wall of the test tube come from.

 

First of all, we need to tell you that there is absolutely no problem that the inner wall of the test tube contains water droplets. It is not real water, but an additive such as a coagulant or anticoagulant. As each biochemical experiment item has different requirements for blood sample, such as whole blood test, serum test or plasma test, their requirements are different, which requires corresponding test tube additives for supporting experiments. The additives contained in common evacuated blood collection tubes are as follows:

 

1、 Dry empty pipe without additives

 

When observing the inside of the test tube, there is no water drop. Because there is no additive, the tube wall is simply treated, which has nothing to do with blood. This type of test tube will be mainly used in serum biochemical detection, such as liver and kidney function test, electrolyte test, thyroid test, etc.

 

2、 Accelerator tube

 

The inner wall of the blood collection tube will not only be coated with silicone oil to prevent wall hanging, but also will be added with a coagulant. The coagulant will be in powder form when it is produced. It needs to be prepared into a solution and added into the test tube to promote blood coagulation and shorten the test time. If it is not dried, water droplets will appear, but it will not affect the experiment.

3、 Blood collection tube containing separating gel and anticoagulant

 

After the tube wall has been silicified, serum separating gel or anticoagulant will be added inside. The separating gel has affinity with PET tube and will promote blood separation. The role of anticoagulant is to effectively detect in a short time and prevent blood coagulation. For example, commonly used anticoagulants include potassium EDTA, potassium tripotase, sodium heparin, lithium heparin, etc.

 

Most of the anticoagulants produced by the manufacturers are in powder form. During use, they should be prepared into solutions and added to the test tubes, and then dried with a dryer. If the temperature is not enough, or other factors affect, there will be some water droplets on the inner wall of the test tubes, but on the whole, there will be no interference to the experiment, which you can rest assured.

 

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