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    IQ / OQ / PQ

    Installation, Operational, and Performance Qualification - the three stages of equipment and process qualification.

    Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed September 19, 2026

    Definition

    IQ verifies that equipment is installed per specification; OQ verifies that it operates within defined limits; PQ verifies that the integrated process consistently produces conforming output. Together they support process validation. OQ typically challenges process parameters at the edges of their operating windows to show the process still produces acceptable results, while PQ runs at nominal conditions over multiple runs or lots to show reproducibility. The GHTF process validation guidance (SG3/N99-10) is still widely used as a reference for this approach. Protocols must define acceptance criteria in advance, and deviations must be documented and assessed.
    What the regulation says
    The FDA, in its Guidance for Industry Process Validation: General Principles and Practices, emphasizes that Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ) are key stages in establishing documented evidence that a process will consistently produce a product meeting its predetermined specifications and quality attributes. Similarly, ISO 13485:2016, a standard for medical device quality management systems, implicitly requires these qualification steps as part of its clauses on production and service provision, ensuring process control and validation. The EU MDR (Regulation (EU) 2017/745) also mandates process validation where the conformity of the product cannot be determined from later inspection and testing, which typically involves IQ, OQ, and PQ activities.

    What this means in practice

    A well-known shorthand, but the structure varies - software validation and aseptic process validation each have their own variants.

    Examples

    • Performing IQ for a new sterilization autoclave by verifying that it is installed according to the manufacturer's specifications, including utility connections and calibration.
    • Conducting OQ for a tablet press by challenging its operational limits, such as speed and pressure, to ensure it functions consistently within specified ranges under various conditions.
    • Executing PQ for a packaging line by running production batches to confirm that the integrated process reliably produces sealed and labeled packages meeting all quality requirements over an extended period.
    Common pitfalls
    • •Confusing IQ/OQ/PQ as a one-time event rather than a lifecycle approach that includes re-qualification or continuous monitoring.
    • •Failing to establish clear acceptance criteria for each qualification stage, leading to ambiguous results or unvalidated processes.
    • •Not adequately documenting all qualification activities, including deviations and resolutions, which can lead to regulatory non-compliance during audits.
    • •Applying a generic IQ/OQ/PQ approach without tailoring it to the specific risks and complexities of the process or equipment being validated.
    • •Underestimating the resources, time, and expertise required to perform thorough and effective IQ/OQ/PQ activities.

    Frequently asked questions

    IQ/OQ/PQ is typically required for new or modified equipment, processes, and systems that can affect product quality, especially in regulated industries like MedTech. It's crucial for demonstrating conformity to specifications and regulatory requirements.

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    Sources

    3 sources

    Every citation below opens the original document. Each is graded against our source-tier hierarchy so you can see what rests on binding law versus commentary.

    Tier 2Regulator guidance and consensus· 2Tier 4Trade press and expert commentary· 1
    Link health: 3 verified· last checked 2026-06-20
    FDA·2MDIC·1
    1. 1
      FDA Process Validation Guidance
      Tier 2 Verified
      FDAfda.gov
    2. 2
      MDIC Case for Quality
      Tier 4 Verified
      MDICmdic.org
    3. 3
      FDA - Quality Systems
      Tier 2 Verified
      FDAfda.gov

    Inline markers like [1] jump to the matching reference above.