IQ OQ PQ Explained: What Each Qualification Phase Requires

If you work in pharmaceutical manufacturing or quality assurance, you will encounter IQ, OQ, and PQ on every equipment qualification project. These three phases form the backbone of the qualification lifecycle - and getting them right is not optional. Regulators from the FDA and EMA both expect documented evidence that your equipment performs as intended before it is used in production.

This guide explains what each phase involves, what documentation it produces, and how to structure your qualification programme to satisfy FDA and EU GMP expectations.

What Is Installation Qualification (IQ)?

Installation Qualification is the first phase of the equipment qualification lifecycle. Its purpose is to verify and document that equipment has been delivered and installed correctly, in accordance with the manufacturer's specifications and the approved design documents.

IQ does not test how the equipment performs - it confirms that everything is in place for performance testing to begin. The typical IQ protocol will verify:

• Equipment identification - serial numbers, model numbers, and manufacturer details match the purchase order and URS
• Installation verification - the equipment is installed per the manufacturer's instructions, P&IDs, and site requirements
• Utility connections - power, water, compressed air, and gases are connected correctly and meet specification
• Calibration status - all critical instruments are calibrated and traceable to national standards before testing begins
• Documentation check - operating manuals, drawings, spare parts lists, and SOPs are present and version-controlled

What Is Operational Qualification (OQ)?

Operational Qualification tests that the equipment operates correctly across its full intended operating range - typically including the upper and lower limits of its parameters (often called worst-case conditions). OQ is performed after IQ is approved and any IQ deficiencies have been resolved.

The OQ protocol demonstrates that the equipment functions as designed when operated under defined conditions. Key OQ activities include:

• Parameter range testing - demonstrating that the equipment performs within specification at minimum, maximum, and nominal setpoints
• Alarm and interlock verification - confirming that safety shutdowns and alarms activate at the correct conditions
• Reproducibility testing - running the same operation multiple times to confirm consistent performance
• Control system verification - for computerised equipment, verifying that the software correctly controls the physical parameters
• Clean-in-place / steam-in-place (CIP/SIP) - where applicable, verifying cleaning and sterilisation cycle parameters

All OQ tests must have pre-defined acceptance criteria documented in the approved protocol before execution begins. Testing against predetermined criteria is a fundamental GMP expectation - establishing acceptance criteria after seeing results is a finding in regulatory inspections.

What Is Performance Qualification (PQ)?

Performance Qualification is the final phase, demonstrating that the equipment consistently performs as intended under actual or simulated production conditions. PQ is the closest qualification phase to real-world operation - it tests the complete manufacturing process, not just the equipment in isolation.

PQ differs from OQ in a critical way: where OQ tests the equipment at its operational limits using test media or water, PQ typically uses actual product or a validated surrogate under routine production conditions. This phase bridges equipment qualification and process validation.

A typical PQ protocol includes:

• Multiple production runs (EU GMP guidance typically expects at least three consecutive successful runs)
• Testing under actual batch sizes and batch frequencies
• Verification that process outputs consistently meet product specifications
• Confirmation that environmental controls, utilities, and personnel work together correctly

What Comes Before IQ? Design Qualification (DQ)

Many pharmaceutical teams overlook Design Qualification, but it is a prerequisite for a defensible qualification programme. DQ verifies that the proposed design of equipment, facilities, or utilities is suitable for its intended purpose - before the equipment is purchased or built.

DQ is performed during the design or procurement phase and typically involves reviewing supplier documentation, vendor audits, and comparison of the proposed design against the User Requirements Specification (URS). A well-executed DQ significantly reduces the risk of IQ and OQ failures.

Documentation Requirements for Each Phase

Each qualification phase produces a minimum set of documents:

• Qualification Protocol - the pre-approved test plan, including scope, responsibilities, equipment list, test procedures, acceptance criteria, and signature pages
• Qualification Report - the post-execution summary confirming that all tests were performed and acceptance criteria were met (or documenting deviations)
• Deviation Report - for any test that failed or deviated from the protocol; must include an impact assessment and resolution
• Change Control records - any changes made to the equipment or process during qualification must be controlled and evaluated for impact on the qualification status

All documents must be version-controlled, signed by the executing technician and reviewed by QA, and retained in accordance with your document management SOP. For computerised qualification systems, audit trail integrity applies to all electronic records.

How Long Does IQ OQ PQ Take?

Timeline depends heavily on equipment complexity and resource availability. As a general guide:

• Simple laboratory equipment (balances, pH meters): 1–2 weeks total
• HVAC systems: 4–8 weeks including seasonal mapping
• Autoclaves and sterilisers: 6–10 weeks including multiple cycle runs
• Manufacturing equipment (tablet presses, filling lines): 8–16 weeks
• Large utility systems (purified water, WFI): 12–20 weeks

The most common delay factors are protocol approval cycles, instrumentation calibration scheduling, and supplier documentation gaps discovered during IQ. PHARPRO routinely front-loads DQ and vendor documentation review to compress qualification timelines by 20–30%.