# Phlebotomy Exam Prep 15, Sodium Fluoride (Gray) Tube — Glucose Preservation

Page: https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377/phlebotomy-exam-prep-15-sodium-fluoride-gray-tube-glucose-preservation
Text version: https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377/phlebotomy-exam-prep-15-sodium-fluoride-gray-tube-glucose-preservation.md
Podcast: [Nursing & Healthcare Exam Prep](https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377)
Published: 2026-05-12T22:25:11+00:00
Episode link: https://open-exam-prep.com/
Audio file: https://episodes.captivate.fm/episode/c26e9fe7-0478-4642-ace5-004d29efc8b8.mp3
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Duration seconds: 193

## Resource

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: - The gray top tube contains two key additives: sodium fluoride as an antiglycolytic agent and potassium oxalate as an anticoagulant. - Sodium fluoride's primary role is to preserve glucose by stopping glycolysis, the process where blood cells break down sugar. - This tube is essential for tests requiring highly accurate glucose levels, such as glucose tolerance tests (GTT), lactate, and blood alcohol levels. - A common exam trap is confusing the additives; sodium fluoride preserves the sample, while potassium oxalate prevents clotting. - If sample analysis is delayed, a gray top tube provides a more accurate glucose value than a green top (heparin) tube because it prevents the glucose level from falsely decreasing. 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

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