CPT (Certified Phlebotomy Technician) Practice Exam

The main component of blood that phlebotomists are trained to collect is whole blood or its components, which include serum and plasma. This is significant because phlebotomists are responsible for drawing blood specimens that may be used for a variety of tests and analyses. Whole blood contains red blood cells, white blood cells, platelets, and plasma, and each component can provide valuable information for diagnosing and managing health conditions.

When blood is collected, it can be processed in different ways to separate these components, such as through centrifugation. Plasma, the liquid portion of blood that contains water, salts, and proteins, is crucial for many laboratory tests. Serum, which is obtained after blood has clotted and the solid components have been removed, is also extensively used in diagnostic testing.

Focusing solely on specific components like red blood cells or platelets would limit the scope of testing and the ability to obtain a comprehensive understanding of a patient's health. Therefore, the training on how to collect whole blood or its components is essential for phlebotomists to ensure accurate and useful test results.