Why do you draw so many tubes of blood? What are so many colorful tubes for? Why isn't my blood bright red? At the outpatient blood collection window, we often encounter patients who have such questions, and the examiner will tell you about blood collection!
How many tubes of blood do I need to draw blood for testing?
1. This is determined according to the test items prescribed by the doctor and the required test items;
2. Different projects have different requirements for the preservation and anticoagulation of blood specimens;
3. Generally speaking, the same specimens with preservation requirements, anticoagulation requirements, and testing requirements will be concentrated in a test tube, so that less blood can be drawn.
Why are blood vessels colorful?
For example: red blood collection tube: this type of blood collection tube does not contain additives, and is suitable for routine biochemical serum tests such as liver function, kidney function, etc.
Yellow blood collection tube: also known as inert separating gel coagulation tube, which can make blood coagulate quickly and contains separating gel, which is commonly used for thyroid function, tumor markers, and hormone level detection.
Orange blood collection tube: contains a procoagulant, suitable for hospital emergency experiments, the procoagulant can activate fibrinoproteinase, which can quickly separate the collected blood from serum.
Purple blood collection tube: It is the most common test tube, containing EDTA-K2 anticoagulant, suitable for routine blood testing, blood group and other tests, and the preparation specimen is whole blood.
Blue blood collection tube: It contains sodium citrate 1:9 and is characterized by the fact that 2ml of blood must be collected for coagulation function test.
Green blood collection tube: contains heparin, which is usually used for the detection of trace elements in children.
Black blood collection tube: contains sodium citrate 1:4, suitable for erythrocyte sedimentation experiment. Grey blood collection tube: contains sodium fluoride and is commonly used to measure blood glucose.
Why does the blood look "black"?
The blood of the human body includes arterial blood and venous blood, arterial blood is bright red, and venous blood is dark red. Because the oxygen content carried by hemoglobin in arterial blood is different from that of venous blood, the oxygen saturation of arterial blood is relatively high, and the color of arterial blood can be seen from the outside. By exchanging it with tissues, the amount of oxygen in the blood decreases, and venous blood is formed. At this time, from the outside, the venous blood is dark and purple.
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