American Medical Technologist (AMT) Practice Exam 2026 – All-in-One Resource to Guarantee Exam Success!

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What is the liquid portion of an anticoagulated blood specimen called?

Serum

Plasma

The liquid portion of an anticoagulated blood specimen is called plasma. Plasma is the component of blood that remains after the blood has been treated with an anticoagulant to prevent clotting. It consists primarily of water but also contains proteins, electrolytes, nutrients, hormones, and waste products.

In contrast, serum refers to the liquid portion of blood that is obtained after coagulation has occurred and the clot has been removed, which means it does not contain clotting factors. The other choices, such as fluid and electrolyte solution, do not specifically define the liquid component of blood in the context of an anticoagulated specimen and would not accurately represent what is found in a blood sample that has not clotted. Thus, plasma serves as a critical element for various laboratory tests, allowing for the assessment of numerous blood components and functions.

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Fluid

Electrolyte solution

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