# Phlebotomy Exam Prep 59, Diurnal Variation Drug and Hormone Tests

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Text version: https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377/phlebotomy-exam-prep-59-diurnal-variation-drug-and-hormone-tests.md
Podcast: [Nursing & Healthcare Exam Prep](https://stenobird.com/podcast/nursing-healthcare-exam-prep-7652377)
Published: 2026-06-25T22:25:11+00:00
Episode link: https://open-exam-prep.com/
Audio file: https://episodes.captivate.fm/episode/a521ceac-9804-4231-85ca-5b950c727ece.mp3
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Duration seconds: 198

## 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: - Cortisol levels peak around 8 AM and are lowest in the evening, a critical timing factor for diagnosing endocrine disorders like Cushing's or Addison's disease. - Other common tests like ACTH, TSH, and iron also exhibit significant diurnal variation, making morning collections the standard for accurate interpretation. - Therapeutic drug monitoring requires precise timing for trough levels (drawn right before the next dose) and peak levels (drawn after the dose is administered). - A common exam trap is identifying an incorrect draw time as a pre-analytical error that can lead to misinterpretation of results for time-sensitive tests. - Accurately documenting the exact time of collection is a crucial responsibility for a phlebotomist to ensure the clinical value of timed specimens. 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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