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Tube stopper
A tube stopper is an essential part of a diagnostic lead test. This device is used to collect blood samples in the laboratory. Its needlepoint position allows the needle to be inserted into the vacuum tube without puncturing it. The full needle penetration prevents premature loss of vacuum and leakage of blood. The safety needle holder should be positioned on a table or counter, out of reach of children. The specimen holder should be placed in a safe location where it cannot be reached by children.
Stoppers are made of rubber, which is a pliable material that has some toxicity. The material used to make the stopper is composed of a number of different chemicals, including polyethylene and polypropylene. They should be easily penetrated by a needle and self-seal upon removal of the needle. Additionally, they should maintain a high internal pressure differential. The materials that are suitable for the stopper include silicone, polychloroprene, styrene butadiene, chlorinated ethylene-propylene co-polymers, and isobutylene-isopropene. These chemicals make the stopper soft and flexible, but they can also interfere with the integrity of a specimen by increasing the amount of material that contaminates it.
Some materials are not compatible with blood. For example, TBEP may alter the distribution of drugs such as propranolol or quinidine. This is why rubber stoppers should be formulated with specially-designed materials that prevent the leaching of divalent cations and sulfur. Alternatively, stoppers should be pliable enough to be penetrated by a needle and maintain a low internal pressure differential. The appropriate material for the tube stopper is polychloroprene, silicone, or isobutylene-isopropene.
Choosing the correct tube stopper color for a sample is essential to a successful test. It is important to choose a color that matches the type of sample being collected. The wrong color may interfere with the accuracy of the results. In addition, the tube stopper may not be safe for testing. A yellow tube is best for tests that require a blood sample. A yellow tube is better than a blue one. In a lab, the tube size should be the same as the tube's diameter.
When selecting a tube stopper, consider its color. The color of the tube stopper should not be orange, pink, or tan. These colors can interfere with the accuracy of Anodic Stripping Voltammetry. A white tube stopper is recommended for tests that involve multiple sample needles. If the test requires more than one sample, the rubber cap should be red. If the color is blue, it will not interfere with the results of the test.
Unlike rubber tube stoppers, a rubber tube stopper should be tan or lavender for best results. It should be easy to install and can be used in any application. The color of the tube stopsper should match the color of the glassware. A black tube will not work in some cases. The correct color should always match the sample. This is because the tan and lavender stopper will not match the type of the blood in the test.