Phlebotomy Exam Prep 13, Heparin (Green) Tube — Plasma Chemistry

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Green-top tubes contain heparin (lithium or sodium) which inhibits thrombin to prevent clotting and yield plasma. - They are ideal for STAT chemistry tests because no clot formation time is needed. - A lithium heparin tube must never be used to measure a patient's lithium levels due to sample contamination. - A sodium heparin tube is contraindicated for sodium or electrolyte panel testing for the same reason. - The mnemonic "Never test the additive" is a crucial mental shortcut for avoiding common exam errors with heparin tubes. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep