Why are the collection tubes different colors?
Collection tubes used for blood samples are often colored differently to indicate the type of anticoagulant or additive the tube contains. Different colored tubes are used to hold specific components of blood samples used for different types of tests. This helps prevent contamination or degradation of the blood sample, ensuring accurate test results.
For example, the most commonly used collection tubes include:
1. Red top tube: no anticoagulant, used for serum testing.
2. Lavender Top Tube: Contains the anticoagulant EDTA and is used for complete blood count (CBC) tests and some electrolyte tests.
3. Yellow top tube: Contains anticoagulant ACD, used for coagulation test.
4. Green top tube: Contains the anticoagulant heparin, used for some electrolyte tests and some blood culture tests.
5. Gray top tube: Contains anticoagulant sodium citrate, used for coagulation test.
Some common uses of collection tubes
1. Serum testing: to test for levels of hormones, enzymes, proteins, and other substances in the blood.
2. Complete Blood Count (CBC) testing: to measure the number and types of blood cells in the sample.
3. Electrolyte testing: to measure levels of minerals such as sodium, potassium, and calcium in the blood.
4. Coagulation testing: to evaluate the blood's ability to form clots.
5. Blood culture testing: to identify bacteria or other pathogens that may cause an infection.
Collection tubes are used to collect and transport blood samples for laboratory testing. They come in different sizes, materials, and colors, each designed for a specific purpose. The choice of collection tube depends on the type of test to be performed and the type of anticoagulant or additive required to preserve the blood sample.
1. Blood culture tubes
2. Serum tubes (red top tubes)
3. Coagulation tubes (gray top tubes or light blue top tubes)
4. Heparin tubes (green top tubes)
5. EDTA tubes (lavender top tubes)
6. ACD tubes (yellow top tubes)
The order of draw is the sequence in which blood samples are collected into different tubes in order to avoid cross-contamination and ensure accurate test results. The order of draw is important because different anticoagulants and additives can affect the stability of the blood components and interfere with test results.