Serum is the liquid portion of clotted blood.

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Study for the NHCO Phlebotomy Test. Experience flashcards and multiple-choice questions with hints and explanations. Prepare effectively for your phlebotomy exam!

Multiple Choice

Serum is the liquid portion of clotted blood.

Explanation:
Serum is the liquid portion left after blood has clotted, because the clotting factors are used up in forming the clot. When blood clots, fibrinogen and other clotting factors become part of the clot, leaving behind a clear fluid that contains electrolytes, antibodies, hormones, and wastes. This is different from plasma, which is the liquid part of blood that has not clotted due to the presence of an anticoagulant and still contains fibrinogen and other clotting factors. The red blood cells are the cellular components suspended in blood, not the liquid portion. So describing serum as the liquid portion of clotted blood correctly captures its origin and composition.

Serum is the liquid portion left after blood has clotted, because the clotting factors are used up in forming the clot. When blood clots, fibrinogen and other clotting factors become part of the clot, leaving behind a clear fluid that contains electrolytes, antibodies, hormones, and wastes. This is different from plasma, which is the liquid part of blood that has not clotted due to the presence of an anticoagulant and still contains fibrinogen and other clotting factors. The red blood cells are the cellular components suspended in blood, not the liquid portion. So describing serum as the liquid portion of clotted blood correctly captures its origin and composition.

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