You are required to draw blood from a patient and 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 this purpose?

Test tube containing heparin

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Test tube containing sodium oxalate

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Test tube containing calcium bicarbonate

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Chilled test tube

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Solution

The correct option is C Test tube containing calcium bicarbonate
Calcium plays very important role in blood clotting by converting prothrombin into thrombin. The test tube containing calcium bicarbonate, calcium combine with anticoagulating compound-heparin in blood and promote blood to clot. Chilled test tube can also clot the blood due to low temperature. Heparin and sodium oxalate is the natural anticoagulant agent which do not promote blood to clot. Thus, the correct answer is C.

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