Understanding IQ/OQ/PQ Qualification for Analytical Instruments — Analytical Instrument Guide

IQ, OQ and PQ are three distinct qualification stages, each answering a different question about an instrument. Regulated labs (pharma, biotech, contract testing) need documented evidence for all three - here's what each one actually covers.

Installation Qualification (IQ)

Question answered: Was the instrument installed correctly?

IQ documents that the instrument was received as ordered, installed according to the manufacturer's specifications, and that all utilities (power, gas, drainage) meet requirements. It's a static check performed once, at installation or relocation.

Operational Qualification (OQ)

Question answered: Does the instrument perform to specification?

OQ tests the instrument's key operating parameters - flow rate accuracy, wavelength accuracy, temperature control, injection precision - against the manufacturer's published specifications, using calibrated reference standards.

Performance Qualification (PQ)

Question answered: Does the instrument perform reliably under your actual operating conditions?

PQ verifies the instrument produces consistent, accurate results running your real methods, in your real environment, with your real operators. It's typically repeated on a schedule (e.g. annually) rather than done once.

Why auditors want all three

IQ without OQ tells you the box was installed, not that it works. OQ without PQ tells you it can meet spec in ideal conditions, not that it does so reliably in your lab. Together, the three stages build a documented chain of evidence from "unboxed correctly" to "produces trustworthy data every day" - which is exactly what an audit is checking for.

We provide IQ/OQ/PQ documentation packages sized for both routine QC labs and full pharma audit requirements.