Which test tube is not used from the given option for keeping the blood in non-coagulated state? (for analysis of blood corpuscles)

Test tube with heparin

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Test tube with calcium bicarbonate

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Test tube with sodium oxylate

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Test tube at room temperature

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Solution

The correct option is D Test tube at room temperature
If blood is stored at room temperature, the naturally present clotting factors will result in blood clot which will prevent the analysis of the blood cells.
Therefore, blood is stored mixed with heparin, calcium bicarbonate, sodium oxylate at low temperature to prevent it from clotting.
So, the correct answer is 'Test tube at room temperature'

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