Order Of Draw For Phlebotomy Quiz

EDTA is the additive present in the lavender tube. EDTA stands for ethylenediaminetetraacetic acid, which is an anticoagulant commonly used in blood collection tubes to prevent clotting. It works by binding to calcium ions, which are necessary for the coagulation process. This allows the blood sample to remain in a liquid state, making it suitable for various laboratory tests such as complete blood count (CBC) and blood typing. SSTs (serum separator tubes) contain a gel that separates the serum from the clot after centrifugation, but they do not contain EDTA. Therefore, the correct answer is EDTA.

Oxalate/fluoride is the additive present in the gray tube. Oxalate is used as an anticoagulant, preventing the blood from clotting, while fluoride is a glycolysis inhibitor that helps preserve glucose levels. This additive is commonly used for glucose testing and is also used for some toxicology tests.

The diameter of a needle is measured by its gauge, with the gauge number inversely related to the needle's diameter. Essentially, the higher the gauge number, the thinner the needle. For instance, a 24-gauge needle is much thinner than an 18-gauge needle, which is considered large and commonly used for rapid fluid administration in medical settings. This gauge system is crucial for healthcare professionals to select the appropriate needle size for various procedures, ensuring procedural efficiency and patient comfort.

The correct answer is "None of the above" because the options provided (Heparin, EDTA, and Blood cultures) are not additives commonly present in a red tube. Red tubes are typically used for collecting blood samples for serum testing, which does not require any specific additives. Therefore, none of the options listed are correct.

Heparin is the correct answer because it is an additive commonly used in green tubes for blood collection. Heparin prevents blood clotting by inhibiting the activity of thrombin and other clotting factors. It is often used for tests that require plasma, as it helps to preserve the integrity of the sample by preventing coagulation.

The additive present in the light blue tube used for blood collection is sodium citrate. This anticoagulant prevents blood from clotting by binding calcium ions, which are necessary for the coagulation process. Light blue tubes are commonly used for coagulation tests, such as prothrombin time (PT) and activated partial thromboplastin time (APTT).

Lavender-top tubes are used to collect blood samples for hematological tests. Hematology tests involve the study of blood cells, including red blood cells, white blood cells, and platelets. These tests help in diagnosing and monitoring conditions such as anemia, leukemia, and infections. The lavender-top tubes contain an anticoagulant called ethylenediaminetetraacetic acid (EDTA), which prevents the blood from clotting and allows for accurate analysis of the blood cells. Therefore, the correct answer is Hematology tests.

The additive present in the yellow sterile tube used for blood collection is typically ACD (acid-citrate-dextrose) solution. This solution helps prevent blood clotting by binding calcium, which is necessary for the coagulation process. Yellow tubes with ACD solution are often used for various laboratory tests, including blood cultures and DNA analysis, where the prevention of clotting is crucial.

Sodium fluoride is the correct answer because it is an additive that prevents glycolysis. Glycolysis is a metabolic process that breaks down glucose into pyruvate, and sodium fluoride acts as an inhibitor of the enzymes involved in this process. By inhibiting glycolysis, sodium fluoride helps to preserve the integrity of samples by preventing the breakdown of glucose and the subsequent production of lactic acid. This is particularly important in medical and laboratory settings where accurate glucose measurements are required.

The light green tube, often referred to as a plasma separator tube (PST) or lithium heparin tube, contains the additive Heparin. Heparin is an anticoagulant, which means it prevents the blood from clotting by inhibiting the activity of certain clotting factors. This allows the blood to remain in a liquid state in the tube, making it suitable for various laboratory tests that require plasma, such as chemistry panels, glucose tests, and certain blood gas analyses.