In pharmaceutical manufacturing, one of the most common challenges companies face is not purchasing equipment—but getting that equipment approved for production. Many factories invest heavily in machines like tablet presses, capsule fillers, or packaging lines, only to discover that without proper validation, these machines cannot be used for commercial production.
Regulatory authorities such as the FDA and EU GMP require strict documentation and proof that equipment is safe, stable, and capable of producing consistent, high-quality products. This is where IQ, OQ, and PQ come into play.
Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ) are a series of step-by-step validation processes used to prove that pharmaceutical equipment is installed correctly, operates properly, and consistently produces qualified products. Each stage requires specific tests, documents, and approvals to meet GMP and FDA requirements.
However, for many purchasing managers and project engineers, the biggest problem is not understanding the theory—but knowing exactly what to do, what documents to prepare, and how to pass audits efficiently. This article explains IQ, OQ, and PQ in simple, easy-to-follow steps, with practical execution details that we hope will help you.
What Does IQ OQ PQ Mean?
To understand IQ, OQ, and PQ easily, think of them as three questions you must answer before using any machine:
- IQ: "Is the machine installed correctly?"
- OQ: "Does the machine operate properly?"
- PQ: "Can this machine consistently produce good-quality products?"
These are not just simple checks—they are formal pharmaceutical equipment validation processes. There are written protocols, testing steps, and recorded results. In a pharmaceutical factory, everything must be documented. If there is no record, it is considered "not done" during an audit. Only when equipment passes validation can the products it makes pass GMP inspections, be exported to Europe or the United States, and avoid rejection or recall.
DQ, IQ, OQ, PQ Explained Step by Step
Design Qualification (DQ) – How to Do It Correctly
DQ needs to be done before you purchase the equipment, but many companies overlook it.
Step-by-Step Execution:
Step 1: Define your requirements (URS)
You must clearly write down:
- What product you will produce (tablet, capsule, powder, liquid)
- Production capacity (e.g., 50,000 capsules/hour, 200 kg/batch)
- Compliance requirements (GMP, FDA, CE, cGMP)
- Cleaning requirements (easy to clean, no dead corners)
- Material requirements (SS316L contact parts)
Tip: If your URS is unclear or incomplete, you will face major problems later in the OQ and PQ stages, because the machine may not be able to meet your actual needs.
Step 2: Evaluate suppliers
Check:
- Do they have GMP experience?
- Can they provide IQ/OQ documents?
- Do they support FAT/SAT?
- Have they worked with FDA-audited factories before?
Many cheap suppliers cannot provide validation support at all. You save money upfront, but later you waste months of production time and fail audits.
Step 3: Confirm the design
- Materials must meet GMP standards (e.g., SS316L stainless steel for product contact parts)
- The machine must be easy to disassemble and clean
- The control system must be stable
- Safety features must comply with local regulations
Step 4: QA approval
Both the QA team and the engineering team must approve the design before purchase.
Output Documents:
- URS document
- DQ report (signed by QA)
Installation Qualification (IQ) – What Must Be Done On-Site
IQ begins after the machine arrives at your factory.
This stage proves that the equipment has been delivered, installed, and configured according to specifications.
Step-by-Step Execution:
Step 1: Prepare the installation environment
- Check the cleanroom classification (ISO class)
- Ensure the power supply is stable (voltage, frequency, grounding)
- Confirm that compressed air, water, and exhaust systems are ready
Many IQ failures come from poor site preparation. For example: voltage fluctuations damage the control system, or the steam outlet has no drain.
Step 2: Install the equipment
- Follow the layout drawing
- Adjust the machine position (leveling, anchoring)
- Connect utilities (electricity, air, water, steam)
Step 3: Check all components against the packing list
- Compare with the packing list
- Check for missing parts
- Verify material certificates (especially for contact parts)
- Confirm that spare parts are included as agreed
Step 4: Review documentation
- Operation manual
- Electrical diagrams
- Calibration certificates
- Pneumatic diagrams
- Calibration certificates for all critical instruments (pressure gauges, thermometers, etc.)
- Lubrication schedule
Step 5: Fill out the IQ checklist
- Record every checked item
- Clearly mark pass/fail
- If any deviation occurs, record it immediately
Step 6: QA approval
QA reviews the completed IQ report.
Key Result of IQ:
You have provided written proof that the machine is correctly installed and ready for functional testing.
Operational Qualification (OQ) – How to Test the Machine
OQ is where most companies face difficulties because it requires real testing and technical understanding.
This stage proves that the equipment operates as intended within its specified operating ranges.
Step-by-Step Execution:
Step 1: Define the test plan
Decide in advance:
- Which functions need to be tested (start/stop, speed adjustment, temperature control, etc.)
- Which parameters are critical (speed range, pressure range, temperature range)
- What the acceptance criteria are (pass/fail standards)
Step 2: Prepare test scripts
A test script is a set of step-by-step instructions for the operator.
Examples of OQ tests:
- Start/stop test – The machine starts and stops properly from the control panel
- Emergency stop test – The machine stops immediately when the emergency stop button is pressed
- Alarm test – Each alarm triggers correctly (low pressure, high temperature, etc.)
- Maximum/minimum speed test – Run at minimum, maximum, and setpoint speeds
- No-load run test – Run without any product, just check mechanical stability
Step 3: Execute tests
- Run the machine at low speed – check stability
- Run at high speed – check vibration, noise, and accuracy
- Simulate abnormal conditions – for example, low compressed air pressure
Example for a tablet press:
- Test minimum compression force (e.g., 2 kN)
- Test maximum compression force (e.g., 30 kN)
- Check that tablet hardness changes accordingly
Step 4: Record data
- Write down actual values immediately (never from memory)
- Compare with expected values (according to the protocol)
- Note any differences
Step 5: Handle deviations
If a result fails:
- Stop the test
- Investigate the cause
- Fix the issue and retest
Step 6: QA approval
QA reviews all test results.
Passing OQ means you have written evidence that the machine works properly under all intended operating conditions.
Performance Qualification (PQ) – Real Production Validation
The PQ stage is the most important because it directly affects product quality.
This stage proves that the equipment can consistently produce acceptable products under normal production conditions.
Step-by-Step Execution:
Step 1: Prepare for production
- Use real raw materials
- Use trained operators
- Define the batch size (e.g., 100,000 tablets or 500 kg)
Step 2: Run multiple batches
- Typically 3 consecutive batches
- Use normal production parameters (speed, temperature, pressure)
Step 3: Test product quality
Sample and test:
- Weight variation (each tablet/capsule within limits)
- Hardness (consistent within a batch)
- Dissolution (drug releases correctly)
- Moisture content (for powders)
- Content uniformity (API distributed evenly)
Step 4: Analyze results
- Compare results within a batch (uniformity)
- Compare results between batches (reproducibility)
- Check whether all results meet the preset acceptance criteria
If batches are inconsistent, PQ fails, and production is delayed for weeks or even months.
Step 5: Document everything
- Batch records
- Test results
- Deviations
Step 6: QA approval
You have proven that the machine can produce stable, qualified products.
IQ vs OQ vs PQ
IQ OQ PQ Validation Process
Here is the complete process to follow:
- Write a Validation Master Plan (VMP)
- Prepare IQ/OQ/PQ protocols
- Train your team
- Execute IQ → OQ → PQ
- Record all results immediately
- Fix deviations
- Write final reports
- QA approval
Do not skip any steps, or the audit will fail.
IQ, OQ, PQ Documents, Templates, and Checklists (What You Must Prepare)
Before starting any testing, you must prepare the following documents:
Documents required for IQ:
- Installation checklist (room by room, utility by utility)
- Utility verification form (electricity, air, water, exhaust)
- Component verification list (against packing list)
- Document receipt log (manuals, drawings, certificates)
Documents required for OQ:
- Test scripts (step-by-step for each function)
- Alarm test checklist (each alarm and correct response)
- Speed/parameter verification log
- Deviation log and retest record
Documents required for PQ:
- Batch record template (adapted for qualification batches)
- In-process testing form
- Final product testing report
- Three-batch summary sheet
Note:
Use ready-made templates from experienced suppliers or consultants. This alone can save you 50% of your validation time.
IQ, OQ, PQ Testing Requirements (GMP and FDA)
To pass an audit, you must:
- Follow approved protocols
- Record data in real time
- Not modify data without leaving a trace
- Ensure electronic records comply with 21 CFR Part 11
What auditors will check:
- Is everything documented?
- Is the data reliable?
- Can the results be traced?
The Relationship Between FAT/SAT and IQ/OQ/PQ
Execution Sequence:
Why FAT and SAT are important:
- A good FAT catches 80% of technical problems before the equipment ships
- SAT makes IQ much faster because you already know the equipment works
- Without FAT/SAT, IQ/OQ/PQ often fails repeatedly
A good FAT can reduce your total validation time by 30–50%.
IQ, OQ, PQ in Pharmaceutical Equipment (Real Examples)
Example 1: Capsule Filling Machine
Example 2: Tablet Press
Common Challenges in IQ, OQ, and PQ (And How to Avoid Them)
Why Choosing the Right Supplier Saves You Time
In reality, most IQ, OQ, and PQ delays are not caused by your team—but by equipment that is not validation-ready.
A professional supplier can provide complete IQ/OQ documents, support FAT and SAT, and help you pass audits faster.
Related Questions and Answers
When does IQ, OQ, and PQ need to be repeated?
When equipment is moved, modified, or repaired in a way that could affect product quality. A change control assessment will determine whether full or partial re-validation is needed.
What documents are required for IQ, OQ, and PQ validation?
Protocols, checklists, test scripts, calibration records, and final reports.
What is the difference between qualification and validation?
Qualification is for equipment (IQ/OQ/PQ); validation is for the entire process (e.g., process validation, cleaning validation).
How long does IQ, OQ, and PQ typically take?
Typically a few days to a few weeks, depending on the complexity of the equipment.
Who is responsible for IQ, OQ, and PQ?
The QA team, engineers, and equipment supplier work together.
Conclusion
IQ, OQ, and PQ are not just regulatory requirements—they are a practical system that ensures your equipment works correctly and your products meet quality standards. By following clear steps and preparing complete documentation, you can avoid delays, reduce risks, and pass audits successfully.
Looking for Pharmaceutical Equipment That Is Easy to Validate?
LTPM CHINA provides:
- Validation-ready machines
- Complete IQ/OQ/PQ documentation packages
- FAT/SAT support
- Custom turnkey solutions
- 5-year warranty
Contact us now to get free IQ/OQ/PQ templates and expert validation support, and make your project faster, easier, and fully compliant.