Which component is collected after coagulation that does not contain coagulant?

Which component is collected after coagulation that does not contain coagulant?

• A. Plasma
• B. Serum
• C. Platelets
• D. Red blood cells

Answer: (B)

When blood is allowed to clot and then the clot is removed, the liquid that remains is serum. This fluid comes after coagulation, so the clotting factors (like fibrinogen) have been used up and are no longer present, meaning it does not have coagulant activity. This contrasts with plasma, which is obtained from blood treated with an anticoagulant to prevent clotting and therefore still contains clotting factors. Platelets and red blood cells are cellular components that either become part of the clot or stay with the cellular layers, not in the liquid serum.

When blood is allowed to clot and then the clot is removed, the liquid that remains is serum. This fluid comes after coagulation, so the clotting factors (like fibrinogen) have been used up and are no longer present, meaning it does not have coagulant activity. This contrasts with plasma, which is obtained from blood treated with an anticoagulant to prevent clotting and therefore still contains clotting factors. Platelets and red blood cells are cellular components that either become part of the clot or stay with the cellular layers, not in the liquid serum.