Rubber stoppers used indicate a cover in blood collection tubes to the presence or absence of additives to the tube, which is usually portfolio or anti-clotting materials, materials are preservatives to prevent changes in the sample and anticoagulants to prevent form clot and prevent clotting and use special tubes deflated called Vacutainer Tube

These tubes are classified into the following types:

1 - the tube with a red cover Red Tube: and be free of additives such as anticoagulants, there are types of which is added to the silicon element or gels Gel (be red or black color) for the purpose of minimizing the bloody decomposition process and use such pipes in the blood bank and some chemical tests routine and hormones as used in section chapels Serology, and ranges necessary size to that of 2-10 ml As for newborn babies shall be taken at least 0.7 ml of blood with a comma material for serum and should not shake or stir or move the blood after collection, but leave for 15 minutes until all the blood clot then centrifuge process begins to separate blood cells from serum or plasma.

2 - the tube with a purple cover Lavender Tube: and be additive is EDTA tube is filled with one ml of EDTA per 2 ml of blood or 2 ml of EDTA per 5 ml of blood used in the tests of blood and immune and blood bank and testing chemical and when needed elements comic CBC, such as red blood cells and tests count differential white blood cells Differential, and contain, this tube is often the sodium EDTA this tube and mix completely after blood collection, but gently and quietly blend until fully material is being distributed anticoagulant on the tube components of the blood.

3 - Tube with green cover Green Tube: and be added to either sodium or lithium heparin Li. Heparin and be required size is 10 ml and used in the analysis of the Department of Cellular Genetics Cytogenetic as well as to measure the pH PH and blood gases and electrolytes, hormones, amino acids and measuring the concentration of therapeutic drugs and test dehydrogenase enzyme glucose-6-phosphate G6PDH

4 - Tube blue cover Blue Tube: and be added to sodium Street Sodium Citrate where added at least 2.7 ml of it similar to the blood of any size 2.7 ml of blood or added 4.5 ml of sodium Street to the blood and used for analyzes such as blood clotting Coagulation test Alvebrnugen Fibrogen Factor factor, prothrombin time PT prothrombin time and partial PTT

5 - Tube with a yellow cover Yellow Tube: The material is placed in a comma for serum such as gels and taken 5 ml of blood is used in the Department of chapels and in the newborn shall be taken at least 0.3 ml of blood with the presence of an additive EDTA

6 - Tube with a gray cover Gray Tube: used to set the level of glucose and containing potassium fluoride, which prevents glucose concentration change by turning off the decomposition of sugar in the blood cells.