Question

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?

(a) Test-tube containing calcium bicarbonate

(b) Chilled test tube

(c)  Test tube containing heparin

(d) Test tube containing sodium oxalate

Answer 1

Correct Option (a) Test-tube containing calcium bicarbonate

Explanation:

Clotting of collected blood can be prevented by coating the test tubes with silicon or adding chelating agents. Citrate, oxalate heparin and EDTA are anticoagulants.