CPT (Certified Phlebotomy Technician) Practice Exam

The choice of the light green tube is typically associated with the use of lithium heparin as the anticoagulant. This tube is used primarily for tests related to the chemistry section of the laboratory, particularly for cardiac-related assays such as troponin and other cardiac markers.

Lithium heparin prevents clotting, making it suitable for tests that require plasma. In the laboratory environment, samples collected in light green tubes can be sent directly to the chemistry lab, aligning with the types of tests performed on plasma. This information is crucial for understanding the correct application of various blood collection tubes in phlebotomy and laboratory processes.