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IAS ELAP Webinar 23 - Understanding Method Detection Limits (MDLs) for an ELAP Laboratory

Understanding Method Detection Limits (MDLs) for an ELAP Laboratory

Webinar | August 31, 2023 | 9:00am - 10:30am PST

The California State Water Resources Board has approved the Environmental Laboratory Accreditation Program (ELAP) regulations for accrediting environmental laboratories. This free 90-minute live webinar, the 23rd in a series from the International Accreditation Service (IAS), will review MDL procedures and rules.

Overview of Webinar

This webinar will review method detection limit (MDL) procedures and rules and examples of how to implement them in your laboratory. We will discuss EPA and TNI regulations concerning MDLs along with a discussion of detection limits (DLs), practical quantitation limits (PQLs), reporting limits (RLs), limits of quantitation (LOQs). This webinar is intended for laboratory management, supervisors, and analysts.

Additional webinar and login details will be sent once registration is complete.

Overview of Syllabus

  • Introduction

  • Definitions – MDL, PQL, RL, DL, LOQ

  • How to determine a MDL

    • Estimate initial

    • Determine initial

    • Ongoing data collection

    • Ongoing verification

  • Low level spike and blank calculations

  • Ongoing verifications

  • Reporting limits

Who Should Attend?

  • Laboratory Managers and Staff

  • Quality Assurance Officers

  • Technical Managers

  • Program Managers

Date / Time

  • Thursday August 31, 9am - 10:30am (Pacific Time)

Cost Free!

About the Instructor

Tony Francis PhD

Dr. Francis, an IAS instructor and assessor, has extensive experience in chemistry and biology. He provides data integrity training, and data validation. Dr. Francis has assessed numerous laboratories to ISO/IEC 17025 and various TNI Standards. He is a fully qualified NELAC assessor in organic and inorganic chemistry, microbiology, cryptosporidium, radiochemistry, solids, aqueous, tissue, and air. He is an EPA-approved drinking water certification officer in all areas available. He received his PhD in chemistry from the University of Utah, 2003.

Questions? Email: | Call: +1.562.364.8201 Did you miss any of the previous 22 ELAP Trainings? If you weren't able to attend any of the previous California ELAP Webinars, you can watch them for free on the IAS Website at this link. Questions about ELAP? Read the IAS FAQ for California ELAP Regulations in the Important Documents section of the IAS ELAP webpage. Questions About Accreditation? If you have questions about applying for accreditation with IAS, please contact Duncan Millar at or visit IAS online at


Questions Complete Training Schedule for 2023 View all the IAS training courses that are currently planned this year.

About IAS

  • Headquartered in Brea, California, IAS is ideally located to serve labs in California.

  • A Non-governmental Accreditation Body, with the largest scope of accreditations recognized by TNI.

  • A signatory member of the International Laboratory Accreditation Cooperation (ILAC), IAS also provides lab accreditation to ISO/IEC 17025.

  • Providing accreditation services since 1975.

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