--- title: "PAI, Pre-Approval Inspection | MedTech Terms" description: "FDA inspection of a manufacturing facility prior to PMA approval. 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[Home](/) 2. / 3. [Terms](/terms) 4. / 5. [Manufacturing](/terms?cat=Manufacturing) 6. / 7. Pre-Approval Inspection [All terms](/terms) Manufacturing [Regulated Pathways](/ecosystems/regulated-pathways)[Global Markets](/ecosystems/global-markets)[Manufacturing & Supply](/ecosystems/manufacturing-supply)PAI # Pre-Approval Inspection FDA inspection of a manufacturing facility prior to PMA approval. Reviewed by [Christian Espinosa, Founder, Blue Goat Cyber](/authors/christian-espinosa) Last 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](/terms/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](/terms/qsr) (21 CFR Part 820) and if the data submitted in a [Premarket Approval](/terms/pma) (PMA) application is accurate and complete. These inspections are a critical [step](/terms/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](/terms/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 What is the primary purpose of a PAI? 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](/terms/qsr). Who conducts PAIs? What happens if significant deficiencies are found during a PAI? Is a PAI always required for a PMA application? ## Cross-references ### Used by Things that build on this term. - [ Premarket Approval(PMA) ](/terms/pma) ## Related terms Grouped by theme ### Editor's picks · Hand-selected related concepts [ Regulatory Premarket Approval(PMA) FDA's most stringent device marketing application, required for high-risk Class III devices. ](/terms/pma)[ Quality & Risk Quality System Regulation(QSR / 21 CFR 820) FDA's current good manufacturing practice (cGMP) requirements for medical devices. ](/terms/qsr) ### More in Manufacturing · Same category [ Manufacturing Bill of Materials(BOM) Structured list of every component, sub-assembly, and quantity needed to manufacture a device. ](/terms/bom)[ Manufacturing Bioburden Quantification of viable microorganisms on or in a product before sterilization. ](/terms/bioburden)[ Manufacturing Cleanroom Classes (ISO 14644) ISO 14644 classification of cleanrooms by airborne particulate cleanliness (ISO 1 through ISO 9). ](/terms/cleanroom-iso-14644)[ Manufacturing Container Closure Integrity(CCI) Demonstration that a sterile package maintains microbial barrier and contents integrity over the labeled shelf life. ](/terms/container-closure) Cited by Where this term appears across MedTech Terms. Ecosystems (3) - [Regulated Pathways](/ecosystems/regulated-pathways) - [Global Markets](/ecosystems/global-markets) - [Manufacturing & Supply](/ecosystems/manufacturing-supply) ## Primary references 3 sources Link health: 3 verified · last checked 2026-06-20 FDA· 2 IMDRF/GHTF· 1 1. [1 FDA Inspection Resources Verified FDA · fda.gov ](https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/inspection-references) 2. [2 GHTF/IMDRF Process Validation Guidance Verified IMDRF/GHTF · imdrf.org ](https://www.imdrf.org/sites/default/files/docs/ghtf/final/sg3/technical-docs/ghtf-sg3-n99-10-2004-qms-process-guidance-04010.pdf) 3. [3 FDA - Device Manufacturing Verified FDA · fda.gov ](https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/postmarket-requirements-devices) Inline markers like \[1\] jump to the matching reference above. Sponsor note ### Production controls for connected devices? We help device manufacturers operationalize cybersecurity in design transfer, production, and supplier controls. [Book a 30-minute discovery session](https://go.bluegoatcyber.com/meetings/blue-goat-cyber/discovery-session) - No obligation - Expert-led from minute one - NDA available on request MedTech Terms is a community resource sponsored by [Blue Goat Cyber](https://bluegoatcyber.com). Definitions are independent of any vendor. On this term Category Manufacturing Acronym PAI Sources 3 Updated 5/5/2026 [Compare with another term](/compare?a=pai) Learn in 60 seconds Card Lesson Quiz FDA inspection of a manufacturing facility prior to PMA approval. - · PAI findings can delay or block PMA approvals. - · They also give FDA an early view into manufacturing capability. Remember this Watch out: 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. Related terms - [Premarket Approval(PMA) ](/terms/pma) - [Quality System Regulation(QSR / 21 CFR 820) ](/terms/qsr) You may also need Auto-suggested from Manufacturing and shared keywords. - [WHO Prequalification (Diagnostics)(WHO PQ Dx) ](/terms/who-pq-dx) - [Technology Transfer (Manufacturing) ](/terms/tech-transfer) - [Change Control ](/terms/change-control) - [Engineering Change Order / Notice(ECO / ECN) ](/terms/eco-ecn) - [Process Capability (Cp/Cpk) and SPC ](/terms/spc-cpk) - [Risk-Based Monitoring(RBM) ](/terms/risk-based-monitoring) [All Manufacturing terms](/terms?cat=Manufacturing) MedTech Terms An authoritative, plain-language reference for the regulatory, quality, cybersecurity, and software terms that shape modern medical devices. 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