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    Pre-Approval Inspection

    FDA inspection of a manufacturing facility prior to PMA approval.

    Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed May 5, 2026

    Definition

    A Pre-Approval Inspection assesses whether the manufacturing site, processes, and quality systems are in a state of control sufficient to support PMA approval.
    What the regulation says
    The FDA conducts Pre-Approval Inspections (PAIs) to determine if a medical device manufacturer is in compliance with Quality System Regulation (21 CFR Part 820) and if the data submitted in a Premarket Approval (PMA) application is accurate and complete. These inspections are a critical step before granting market authorization for Class III devices, as outlined in FDA guidance documents on PMA applications.

    What this means in practice

    PAI findings can delay or block PMA approvals. They also give FDA an early view into manufacturing capability.

    Examples

    • A manufacturer of a novel implantable cardiac device undergoes a PAI where FDA investigators observe the sterile manufacturing environment and review sterilization validation records.
    • During a PAI for a new diagnostic imaging system, auditors verify the calibration of production equipment and interview quality control personnel about their procedures.
    • An audit team conducts a PAI at a contract manufacturer
    Common pitfalls
    • •A common pitfall is underestimating the thoroughness of a PAI, assuming that only documentation will be reviewed, when in fact direct observation of manufacturing processes and employee interviews are standard.
    • •Another mistake is neglecting to conduct a comprehensive internal audit or mock PAI prior to the actual inspection, which can reveal weaknesses in the quality system.
    • •Failing to adequately address issues identified during previous inspections or internal audits can lead to significant PAI findings and delays.
    • •Inadequate training records or demonstration of employee competency often lead to PAI deficiencies, as these are direct indicators of a controlled manufacturing environment.
    • •Not having clear, well-documented, and consistently followed procedures for all aspects of manufacturing and quality control can result in immediate PAI issues.

    Frequently asked questions

    The primary purpose of a PAI is to verify that a medical device manufacturer can reliably produce a device according to its specifications and in compliance with the Quality System Regulation.

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    Primary references

    3 sources
    Link health: 3 verified· last checked 2026-06-20
    FDA·2IMDRF/GHTF·1
    1. 1
      FDA Inspection Resources
      Verified
      FDAfda.gov
    2. 2
      GHTF/IMDRF Process Validation Guidance
      Verified
      IMDRF/GHTFimdrf.org
    3. 3
      FDA - Device Manufacturing
      Verified
      FDAfda.gov

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