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During a procedure, a blood sample is dr...

During a procedure, a blood sample is drawn from a patient and kept it in a test tube for analysis of blood corpuscles and plasma. Which of the following tubes cannot be used for the purpose?

A

Test tube containing calcium bicarbonate

B

Test tube containing EDTA

C

Test tube containing heparin

D

Test tube containing sodium oxalate

Text Solution

AI Generated Solution

The correct Answer is:
To determine which test tube cannot be used for the analysis of blood corpuscles and plasma, we need to consider the role of anticoagulants in blood collection. Here’s a step-by-step solution: ### Step-by-Step Solution: 1. **Understanding Blood Components**: Blood consists of two main components: blood corpuscles (cells) and plasma (the liquid part). For analysis, it is crucial to keep these components separate without allowing the blood to clot. 2. **Role of Anticoagulants**: Anticoagulants are substances that prevent blood from clotting. Common anticoagulants include: - **EDTA (Ethylenediaminetetraacetic acid)**: A chelating agent that binds calcium ions, preventing clotting. - **Heparin**: A natural anticoagulant that inhibits clotting factors. - **Sodium Oxalate**: Another anticoagulant that binds calcium ions. 3. **Identifying the Problematic Tube**: The question asks which tube cannot be used. For blood to remain in a liquid state and to analyze both corpuscles and plasma, we must avoid any substance that promotes clotting. 4. **Calcium's Role in Clotting**: Calcium ions are essential for the clotting process. They activate various clotting factors. Therefore, any test tube containing calcium (like calcium bicarbonate) would promote clotting, making it unsuitable for our purpose. 5. **Conclusion**: Since we need to prevent coagulation to analyze blood corpuscles and plasma, a test tube containing calcium bicarbonate cannot be used. Thus, the answer is the test tube with calcium bicarbonate. ### Final Answer: The test tube that cannot be used for the analysis of blood corpuscles and plasma is the one containing **calcium bicarbonate**. ---
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