Which of the following tube additives promotes clot formation?
Silica promotes clot formation.
Silica acts as a clot activator by providing a surface for platelets to adhere and aggregate, thereby promoting the clotting process. This property is utilized in certain blood collection tubes to enhance coagulation.
Heparin is an anticoagulant that inhibits clot formation by enhancing the activity of antithrombin III, which prevents the conversion of fibrinogen to fibrin. As a result, heparin is used in blood collection tubes designed to prevent clotting rather than promote it.
Oxalate is another anticoagulant that works by binding calcium ions in the blood, which are essential for the clotting process. This action effectively inhibits clot formation, making oxalate a choice for preserving blood samples rather than promoting coagulation.
Citrate functions similarly to oxalate by chelating calcium ions, thereby preventing clotting. It is commonly used in blood collection tubes for tests requiring anticoagulated blood, further confirming that citrate does not promote but rather inhibits clot formation.
Silica serves as a clot activator by providing a surface that facilitates platelet activation and aggregation, leading to the formation of a clot. This property is beneficial in certain blood collection tubes designed for serum separation, allowing for effective sample processing.
In summary, silica is unique among the options provided as it actively promotes clot formation by facilitating platelet aggregation. In contrast, heparin, oxalate, and citrate all serve as anticoagulants, inhibiting the clotting process for various laboratory applications. Understanding these differences is crucial for selecting the appropriate additives for specific blood collection and testing purposes.
Related Questions
View allA phlebotomist should instruct a patient to take which of the followin...
Which of the following should a phlebotomist anticipate for a patient...
How many × should an EDTA tube be inverted after blood collection?
Anchoring the selected vein for a venipuncture using a winged infusion...
A culture and sensitivity test is sent to which of the following divis...
Related Quizzes
View all- ✓ 500+ Practice Questions
- ✓ Detailed Explanations
- ✓ Progress Analytics
- ✓ Exam Simulations