Vacuum blood collection tube is a disposable, negative pressure vacuum glass/pet tube for quantitative blood collection, which needs to be used in conjunction with a venous blood collection needle.
Types of tubes：
Vacuum tubes may contain additional substances that preserve blood for processing in a medical laboratory. Using the wrong tube may make the blood sample unusable for the intended purpose. These additives are typically thin film coatings applied using an ultrasonic nozzle.
The additives may include anticoagulants (EDTA, sodium citrate, heparin) or a gel with density between those of blood cells and blood plasma. Additionally, some tubes contain additives that preserve certain components of or substances within the blood, such as glucose. When a tube is centrifuged, the materials within are separated by density, with the blood cells sinking to the bottom and the plasma or serum accumulating at the top. Tubes containing gel can be easily handled and transported after centrifugation without the blood cells and serum mixing.
There are 8 types of vacuum blood collection tubes, which are differentiated by the color of the top:
No additives（plain red-top）、
Clot activator blood collection tube(red-top)、
SST(yellow-top)、
EDTA tube(purple-top)、
Sodium Citrate Tubes(blue-top)、
Heparin tube(green-top)、
Glucose tube(grey-top)、
ESR tube（black-top).
