QMS Audit Expert

ISO 13485 internal audit methodology for medical device quality management systems.

Table of Contents

• [Audit Planning Workflow](#audit-planning-workflow)

• [Audit Execution](#audit-execution)

• [Nonconformity Management](#nonconformity-management)

• [External Audit Preparation](#external-audit-preparation)

• [Reference Documentation](#reference-documentation)

• [Tools](#tools)

Audit Planning Workflow

Plan risk-based internal audit program:

• List all QMS processes requiring audit

• Assign risk level to each process (High/Medium/Low)

• Review previous audit findings and trends

• Determine audit frequency by risk level

• Assign qualified auditors (verify independence)

• Create annual audit schedule

• Communicate schedule to process owners

• Validation: All ISO 13485 clauses covered within cycle

Risk-Based Audit Frequency

Risk Level

Frequency

Criteria

High

Quarterly

Design control, CAPA, production validation

Medium

Semi-annual

Purchasing, training, document control

Low

Annual

Infrastructure, management review (if stable)

Audit Scope by Clause

Clause

Process

Focus Areas

4.2

Document Control

Document approval, distribution, obsolete control

5.6

Management Review

Inputs complete, decisions documented, actions tracked

6.2

Training

Competency defined, records complete, effectiveness verified

7.3

Design Control

Inputs, reviews, V&V, transfer, changes

7.4

Purchasing

Supplier evaluation, incoming inspection

7.5

Production

Work instructions, process validation, DHR

7.6

Calibration

Equipment list, calibration status, out-of-tolerance

8.2.2

Internal Audit

Schedule compliance, auditor independence

8.3

NC Product

Identification, segregation, disposition

8.5

CAPA

Root cause, implementation, effectiveness

Auditor Independence

Verify auditor independence before assignment:

• Auditor not responsible for area being audited

• No direct reporting relationship to auditee

• Not involved in recent activities under audit

• Documented qualification for audit scope

Audit Execution

Conduct systematic internal audit:

• Prepare audit plan (scope, criteria, schedule)

• Review relevant documentation before audit

• Conduct opening meeting with auditee

• Collect evidence (records, interviews, observation)

• Classify findings (Major/Minor/Observation)

• Conduct closing meeting with preliminary findings

• Prepare audit report within 5 business days

• Validation: All scope items covered, findings supported by evidence

Evidence Collection

Method

Use For

Documentation

Document review

Procedures, records

Document number, version, date

Interview

Process understanding

Interviewee name, role, summary

Observation

Actual practice

What, where, when observed

Record trace

Process flow

Record IDs, dates, linkage

Audit Questions by Clause

Document Control (4.2):

• Show me the document master list

• How do you control obsolete documents?

• Show me evidence of document change approval

Design Control (7.3):

• Show me the Design History File for [product]

• Who participates in design reviews?

• Show me design input to output traceability

CAPA (8.5):

• Show me the CAPA log with open items

• How do you determine root cause?

• Show me effectiveness verification records

See references/iso13485-audit-guide.md for complete question sets.

Finding Documentation

Document each finding with:

Requirement: [Specific ISO 13485 clause or procedure]

Evidence: [What was observed, reviewed, or heard]

Gap: [How evidence fails to meet requirement]

Example:

Requirement: ISO 13485:2016 Clause 7.6 requires calibration

at specified intervals.

Evidence: Calibration records for pH meter (EQ-042) show

last calibration 2024-01-15. Calibration interval is

12 months. Today is 2025-03-20.

Gap: Equipment is 2 months overdue for calibration,

representing a gap in calibration program execution.

Nonconformity Management

Classify and manage audit findings:

• Evaluate finding against classification criteria

• Assign severity (Major/Minor/Observation)

• Document finding with objective evidence

• Communicate to process owner

• Initiate CAPA for Major/Minor findings

• Track to closure

• Verify effectiveness at follow-up

• Validation: Finding closed only after effective CAPA

Classification Criteria

Category

Definition

CAPA Required

Timeline

Major

Systematic failure or absence of element

Yes

30 days

Minor

Isolated lapse or partial implementation

Recommended

60 days

Observation

Improvement opportunity

Optional

As appropriate

Classification Decision

Is required element absent or failed?

├── Yes → Systematic (multiple instances)? → MAJOR

│   └── No → Could affect product safety? → MAJOR

│       └── No → MINOR

└── No → Deviation from procedure?

    ├── Yes → Recurring? → MAJOR

    │   └── No → MINOR

    └── No → Improvement opportunity? → OBSERVATION

CAPA Integration

Finding Severity

CAPA Depth

Verification

Major

Full root cause analysis (5-Why, Fishbone)

Next audit or within 6 months

Minor

Immediate cause identification

Next scheduled audit

Observation

Not required

Noted at next audit

See references/nonconformity-classification.md for detailed guidance.

External Audit Preparation

Prepare for certification body or regulatory audit:

• Complete all scheduled internal audits

• Verify all findings closed with effective CAPA

• Review documentation for currency and accuracy

• Conduct management review with audit as input

• Prepare facility and personnel

• Conduct mock audit (full scope)

• Brief personnel on audit protocol

• Validation: Mock audit findings addressed before external audit

Pre-Audit Readiness Checklist

Documentation:

• Quality Manual current

• Procedures reflect actual practice

• Records complete and retrievable

• Previous audit findings closed

Personnel:

• Key personnel available during audit

• Subject matter experts identified

• Personnel briefed on audit protocol

• Escorts assigned

Facility:

• Work areas organized

• Documents at point of use current

• Equipment calibration status visible

• Nonconforming product segregated

Mock Audit Protocol

• Use external auditor or qualified internal auditor

• Cover full scope of upcoming external audit

• Simulate actual audit conditions (timing, formality)

• Document findings as for real audit

• Address all Major and Minor findings before external audit

• Brief management on readiness status

Reference Documentation

ISO 13485 Audit Guide

references/iso13485-audit-guide.md contains:

• Clause-by-clause audit methodology

• Sample audit questions for each clause

• Evidence collection requirements

• Common nonconformities by clause

• Finding severity classification

Nonconformity Classification

references/nonconformity-classification.md contains:

• Severity classification criteria and decision tree

• Impact vs. occurrence matrix

• CAPA integration requirements

• Finding documentation templates

• Closure requirements by severity

Tools

Audit Schedule Optimizer

# Generate optimized audit schedule

python scripts/audit_schedule_optimizer.py --processes processes.json

# Interactive mode

python scripts/audit_schedule_optimizer.py --interactive

# JSON output for integration

python scripts/audit_schedule_optimizer.py --processes processes.json --output json

Generates risk-based audit schedule considering:

• Process risk level

• Previous findings

• Days since last audit

• Criticality scores

Output includes:

• Prioritized audit schedule

• Quarterly distribution

• Overdue audit alerts

• Resource recommendations

Sample Process Input

{

  "processes": [

    {

      "name": "Design Control",

      "iso_clause": "7.3",

      "risk_level": "HIGH",

      "last_audit_date": "2024-06-15",

      "previous_findings": 2

    },

    {

      "name": "Document Control",

      "iso_clause": "4.2",

      "risk_level": "MEDIUM",

      "last_audit_date": "2024-09-01",

      "previous_findings": 0

    }

  ]

}

Audit Program Metrics

Track audit program effectiveness:

Metric

Target

Measurement

Schedule compliance

>90%

Audits completed on time

Finding closure rate

>95%

Findings closed by due date

Repeat findings

<10%

Same finding in consecutive audits

CAPA effectiveness

>90%

Verified effective at follow-up

Auditor utilization

4 days/month

Audit days per qualified auditor