IQ, OQ, and PQ (installation qualification, operational qualification, and performance qualification) are the three sequential stages of equipment qualification: documented evidence that a machine is installed correctly (IQ), operates as intended across its specified ranges (OQ), and consistently produces conforming output under real production conditions (PQ). The framework comes from GMP-regulated industries such as pharmaceuticals and medical devices, but any manufacturer commissioning critical equipment can use it.
IQ proves the equipment arrived and was installed per specification. Typical IQ checks include: the delivered model and options match the purchase order, utilities (power, air, water, network) meet the manufacturer's requirements, the environment is suitable, safety devices are in place, software versions are recorded, and manuals, drawings, and spare parts lists are on file. IQ is mostly a verification of facts, and it is where the equipment's documentation baseline is created.
OQ proves the equipment functions correctly across its intended operating range, not just at one comfortable setpoint. Tests typically challenge worst-case settings: minimum and maximum speeds, temperatures, pressures, or recipe parameters, plus alarms, interlocks, and power-loss recovery. Each test has a predefined acceptance criterion written before execution, and results are recorded as measured values.
PQ proves the whole process delivers conforming product consistently under normal production conditions: real materials, trained operators, standard procedures, and production-representative run lengths. PQ commonly spans multiple runs or days (three consecutive successful runs is a widespread convention) and evaluates output quality statistically rather than checking single functions.
Each stage gates the next: an OQ run on a badly installed machine proves nothing, and a PQ cannot rescue functions that failed OQ. Skipping ahead is the most expensive shortcut in commissioning.
A curing oven is specified to hold any setpoint between 60 and 180 degrees C within plus or minus 2 degrees. The OQ protocol tests three setpoints: 60, 120, and 180 degrees, with 9 mapped probe positions logged for 30 minutes each. At 180 degrees, the worst probe averages 181.3 degrees with a maximum of 181.9: inside the limit, pass. At 60 degrees, one corner probe drifts to 62.4 degrees: outside the limit, fail. The deviation is traced to a damaged door seal, the seal is replaced, and the 60-degree test is re-run at 61.1 degrees maximum: pass. The OQ report records all measured values, the deviation, and the re-test, giving the PQ stage a proven operating envelope to run inside.
Equipment qualification is one building block of process validation: qualification proves the equipment; validation proves the process that uses it. The distinction matters in audits, and it parallels the difference between verification and validation generally. Our guide on process validation vs process verification covers when each approach applies. Measurement systems used in qualification should themselves be proven with a gauge R&R study, and ongoing production controls belong in a control plan.
Qualification is a snapshot; the qualified state erodes through wear, repairs, and parameter changes. Three habits protect it. First, complete maintenance records: every work order on qualified equipment documented in a CMMS, so requalification decisions after repairs are based on facts. Second, disciplined preventive maintenance so performance does not drift between checks. Third, continuous monitoring of equipment behavior: with Fabrico, real-time production monitoring and maintenance history live on the same asset record, so engineers can see when output or stop patterns change on qualified equipment and react before an audit or a batch failure finds it first.
No. The depth of qualification should match risk. A quality-critical sterilizer needs full IQ, OQ, and PQ with tight documentation; a low-risk conveyor may only need a documented installation check. A risk assessment decides the scope before qualification starts.
After changes that could affect the qualified state: major repairs, relocation, software upgrades, or process parameter changes outside the proven envelope. Many sites also run periodic reviews of maintenance and performance records to confirm the qualified state still holds.
OQ tests the equipment's functions against specifications, usually with test loads and worst-case settings. PQ tests the full production process under normal conditions with real product and evaluates the output statistically over sustained runs.
Keep qualified equipment provably under control with live machine data and complete maintenance history in one place. Book a Fabrico demo.
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