AMCA PTC Practice Questions - AMCA Phlebotomy Technician Certification Exam

Which additive is found in the light blue-top tube and what is its primary function in coagulation testing?

EDTA — binds calcium to prevent clotting Sodium citrate — chelates calcium to prevent clotting and preserves clotting factors Lithium heparin — inhibits thrombin activity Sodium fluoride — inhibits glycolysis to preserve analyte stability

Correct Answer:

Sodium citrate — chelates calcium to prevent clotting and preserves clotting factors

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