# Phlebotomy Exam Prep 12, Sodium Citrate (Light Blue) Tube — Coag Testing

Page: https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377/phlebotomy-exam-prep-12-sodium-citrate-light-blue-tube-coag-testing
Text version: https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377/phlebotomy-exam-prep-12-sodium-citrate-light-blue-tube-coag-testing.md
Podcast: [Nursing & Healthcare Exam Prep](https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377)
Published: 2026-05-09T22:25:11+00:00
Episode link: https://open-exam-prep.com/
Audio file: https://episodes.captivate.fm/episode/2c8cbcfe-2a47-4391-b69b-6d9a94c96a3e.mp3
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Duration seconds: 186

## 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 light blue (sodium citrate) tube requires a precise 9:1 blood-to-anticoagulant ratio for accurate coagulation testing. - Underfilling a light blue tube creates an excess of anticoagulant, which leads to falsely prolonged clotting times and an artificially elevated INR. - Key coagulation tests performed using the light blue tube include PT/INR, PTT/aPTT, fibrinogen, and D-dimer. - A discard tube is mandatory when using a butterfly (winged infusion) set if the light blue tube is the first or only tube drawn, in order to purge air from the tubing and ensure a full draw. - The mnemonic "Blue's Clues: Nine to one or the test is done" is a helpful way to remember the critical fill ratio. 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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## Transcript

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