The substance to be added to the blood sample drawn from the patient for analysis of blood corpuscles and plasma is:

Concept:

• Anticoagulant: It is a chemical substance commonly known as a blood thinner that prevents the blood from getting coagulated or clotted. These are primarily used for the analysis of blood cells & during dialysis.
• Some of the anticoagulants used are Sodium citrate, Sodium EDTA & Heparin.

​Explanation:

• Heparin is the most powerful anticoagulant. It activates the Antithrombin III present in the blood plasma
• The antithrombin binds and deactivates the serum clotting factors, this prevents the clotting of blood.
• Moreover, Heparin works in both in-vivo & in-vitro conditions, thus heparin is to be added to the blood sample drawn from the patient for analysis of
  blood corpuscles and plasma.