Q. You are required to draw blood from 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
Explanation
Clotting of collected blood can be prevented by coating the test tubes with silicon or adding chelating agents. Heparin is an anticoagulant and is not suitable for blood counts as it alters the shape of $RBC_{S}$ and$\ WBC_{S}$, which affects blood testing.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.