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The calcium citrate is a powerful anticoagulant that binds to the calcium in the blood required for clotting. How much of the chemical the tubes contain is very much a function of the specifications of the manufacturer. Some are more liable to increase calcium citrate levels than others. The red bottle is less common – it is used for biochemistry tests requiring serum which might be adversely affected by the separator gel used in the yellow bottle.

Tubes with SPS – For Blood and bodily fluid cultures (HLA, DNA, Paternity). The SPS aids in the recovery of microorganisms by slowing down/ stopping the actions of complement, phagocytes, and certain antibiotics. Most people think bandeau tops are best for the beach, but we beg to differ. These gems can be layered underneath sheer blouses and dresses – giving extra coverage when the autumn months come around. We especially love them with high-waisted jeans and over-the-knee boots. Aztec glamourPhlebotomists use pearl tubes for HHV-6, adenovirus and toxoplasma PCRs. Typically they contain a separating gel and EDTA. Pearl tubes typically draw 6 ml, with a minimum of 4 ml Gold Top In many cases, there is no need to open purple tubes. Manufacturers design them for direct sampling. Laboratory uses: Chemistry Testing (Plasma determinations in chemistry) : ammonia, carboxyhemoglobin & STAT electrolytes, chromosome screening, insulin, renin and aldosterone

Royal blue-capped tubes have no additives and are usually made of special glass or plastic that will not contaminate the specimen. Phlebotomists use royal blue tubes to test: This less commonly used bottle is for biochemistry tests which require heparinised plasma or whole blood for analysis. Light blue-topped tubes come with two main additives: CTAD (Citrate, theophylline, adenosine, dipyridamole) and sodium citrate at concentrations of 3.2 or 3.8 percent. To activate red-topped tubes, phlebotomists must invert them several times to mix the solution. Clotting usually occurs within around 30 minutes. The blue bottle is used for haematology tests involving the clotting system, which require inactivated whole blood for analysis.The tubes come pre-lined with various types of EDTA depending on the application. They keep white blood cells, platelets and other blood constituents stable (without coagulation) for up to 24 hours.

Phlebotomists use yellow-topped tubes for DNA studies – such as paternity tests – and HIV cultures. The solution typically consists of a combination of citric acid, dextrose and trisodium citrate. Tan Royal blue tubes are ideal for tests that do not require either coagulation or anticoagulation to generate reliable results. Pearl TopSometimes, phlebotomists will use multiple different colors of vials for the same tests. Blue, purple and pink-topped tubes are sometimes interchangeable with yellow. What additive does: Sodium fluoride acts as an antiglycolytic agent to ensure that no further glucose breakdown occurs within the sample after it is taken. Potassium oxalate removes calcium and acts as an anticoagulant.