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OOS Investigations: Decision-Making in Practice and FDA Expectations for 2026

How to interpret results, recognize signals, and align with current FDA expectations

  • Meredith Crabtree
  • FDB1414
  • Meredith Crabtree
  • FDB1414
  • 90 Minutes Learning Time
This course equips quality and laboratory teams to make earlier, better-grounded OOS decisions by improving how results are interpreted, when investigation scope is expanded, and how conclusions are documented.
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ONE participant (viewer) – Live session Plus Complimentary 30 Days Streaming access

Up to 10 participants – Live session Plus Complimentary 30 Days Streaming access

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Why take this course?

OOS results are rarely isolated laboratory events. They test how assumptions are made, how evidence is interpreted, and whether the quality system can respond when a result falls outside expectations. In many investigations, retesting starts early, possible causes are narrowed too soon, and the review structure masks weak scientific reasoning. Those weaknesses matter because FDA scrutiny is centered not only on whether an investigation was completed, but on how each decision was made.

This program focuses on the investigation pathway from the initial result through cause evaluation and final documentation. It examines how laboratory findings, process signals, and quality indicators should be weighed, and where overlooked inconsistencies or undocumented assumptions begin to weaken the credibility of the outcome. Attention is placed on recognizing when an inquiry should remain limited and when it needs to move beyond the laboratory.

  • Strengthen the first decisions after an OOS result:

    Many OOS investigations lose credibility in the first hours because interpretation starts narrowing before the evidence is fully considered. This course strengthens how teams assess the initial result, identify inconsistencies, and decide whether immediate assumptions are justified.

  • Judge when the issue is larger than the laboratory:

    A strong OOS investigation depends on knowing whether the issue is confined to the laboratory or points to wider process concerns. This course improves how teams weigh laboratory findings against process signals and other quality indicators, and how they decide when escalation is warranted.


  • Document conclusions with clearer scientific reasoning:

    Closing an OOS investigation requires more than a finished form. This course helps teams document conclusions so the reasoning behind each decision is clear, consistent, and scientifically grounded.

Key Areas Covered

  • How OOS results are initially assessed and why early decisions often shape the entire investigation
  • Recognizing meaningful signals, trends, and inconsistencies that may not be immediately obvious
  • Approaches to evaluating laboratory error versus potential process-related causes
  • How investigation pathways are structured, including when to expand beyond the laboratory
  • Documentation practices that reflect clear thinking, scientific reasoning, and consistent decision-making
  • FDA expectations for OOS investigations, including key principles from 21 CFR Part 211 and related guidance

This Course is designed for professionals responsible for result assessment, investigation oversight, and quality decisions that must withstand regulatory review.


A must for QA/QC, Manufacturing, Operations, Research and Development, Regulatory Affairs, Compliance, and Validation Departments.

COURSE DIRECTOR

Carolyn Troiano

Carolyn Troiano has more than 45 years of experience in computer system validation across pharmaceutical, medical device, biotechnology, tobacco, and other FDA-regulated industries. She has advised companies on FDA compliance, CSV, and large-scale IT implementations, and participated in the FDA/Industry Partnership that developed 21 CFR Part 11 for electronic records and electronic signatures.

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Ready to Strengthen Your Team? Let’s Build Your Training Plan.

Whether you’re looking for a single onsite workshop or a multi-team training series, we’ll help you design a program that fits your goals, timelines, and operational reality.

Your team deserves the clarity.
Your organization deserves the confidence.

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