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You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose?

1. Test tube containing calcium bicarbonate
2. Chilled test tube
3. Test tube containing heparin
4. Test tube containing sodium oxalate

Correct answer: Test tube containing calcium bicarbonate

Solution

For examining blood corpuscles and plasma, the blood must remain unclotted, so anticoagulants like heparin or sodium oxalate are suitable. A tube containing calcium bicarbonate would favor clotting rather than prevent it, so it is not used.

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