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Uses of blood collection tubes of different colors

Views:2     Author:Site Editor     Publish Time: 2021-05-17      Origin:Site

The standard blood collection tube adopts the internationally-used head cover and label. Different colors indicate different types of additives and test purposes. Let's take a look at the common uses of vacuum blood collection tubes.


Red: Dry vacuum tube

The most commonly used test tube for serum biochemical and immunological testing during blood collection. The inner wall is evenly coated with silicone oil to prevent the wall from hanging. It uses the principle of natural blood coagulation to coagulate the blood. After the serum is separated, the test tube can be centrifuged for testing.


Golden yellow: inert separation gel accelerating tube

It is often used for the detection of thyroid function, tumor markers, PCR and hormone levels. It is highly respected for its stability. It is an inert separating gel which acts as an isolation on the basis of the coagulation tube. After centrifugation, this separation gel can completely separate the liquid components (serum) and solid components (blood cells) in the blood and completely accumulate in the center of the test tube to form a barrier, and remain stable within 48 hours. It should be noted that the blood should be inverted and mixed immediately after blood collection, and centrifuged for 30 minutes.


Orange red: Coagulation tube

It is mostly used in emergency biochemical tests. Because of the addition of a coagulant that can activate fibrin, soluble fibrin can be turned into insoluble fibrin polymer, and then a stable fibrin clot can be formed. Generally, let it stand for 5 minutes after blood sampling The blood coagulates and can be tested by centrifugation.


Green: heparin anticoagulation

This type of anticoagulant tube with heparin is often used when detecting trace elements for children, because heparin can prevent the formation of thrombin and the aggregation of platelets. However, it should be noted that the sodium heparin tube cannot be used when detecting sodium ions in the specimen; this tube also cannot be used for white blood cell counting and classification, because heparin can cause white blood cell aggregation.


Purple: EDTA anticoagulant tube

The purple test tube is the hero of the hematology system test, because the ethylenediaminetetraacetic acid (EDTA) in it can effectively chelate the calcium ions in the blood sample, remove the calcium from the reaction site, block and stop the endogenous Or the exogenous coagulation process can prevent the specimen from clotting, but it can make the lymphocytes appear flower-shaped nucleus, and can also stimulate the appearance of EDTA-dependent aggregation of platelets. Therefore, it cannot be used for coagulation experiments and platelet function tests. Generally, we reverse and mix the blood immediately after the blood is collected, and the sample needs to be mixed before the test, without centrifugation.


Blue: Coagulation test tube

This is the blue test tube with sodium citrate that I will introduce! Sodium citrate acts as an anticoagulant by chelating with calcium ions in the blood sample. Since the ratio of anticoagulant to blood should be 1:9, it is necessary to ensure a sufficient and accurate amount of 2mL to ensure the reliability of the test results. At the same time, blood is collected. Immediately afterwards, invert and mix to avoid solidification.


Black: erythrocyte sedimentation rate test tube

The erythrocyte sedimentation rate test tube needs to use 3.2% sodium citrate tube, which needs to collect enough blood to ensure that the ratio of anticoagulant to blood is 1:4, because if the ratio of anticoagulant is too high, the blood will be diluted and the erythrocyte sedimentation rate will be accelerated. , After blood collection, it should be inverted and mixed immediately to avoid coagulation.


Gray: blood glucose tube

This is a test tube used to monitor blood sugar. It contains weak anticoagulant potassium oxalate or sodium fluoride, which plays a good role in preventing the degradation of blood sugar. It is an excellent preservative for blood sugar. It needs to be slowly inverted and mixed during use. It should be noted that it cannot be used for the determination of urea by the urease method, nor can it be used for the detection of alkaline phosphatase and amylase.


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