For a sequencing instrument, instrument qualification through IQ, OQ, and PQ is the documented process that establishes the instrument was delivered correctly, works to specification, and performs consistently for its intended use. In a regulated or accredited laboratory it is a requirement. In a research laboratory it is not, but it remains valuable for a reason that has nothing to do with compliance: it creates a documented baseline of how the instrument performed when it was new and correct, which is the reference point every future question about drift, degradation, or fault gets measured against. Skipping it costs almost nothing on installation day and can cost a great deal later, particularly if research work eventually needs to support a regulated study.
This guide defines each qualification phase as it applies to a sequencer, distinguishes clearly between what research-use and regulated-use laboratories should do, and identifies the documentation to retain from day one. The definitions follow the USP <1058> analytical instrument qualification framework, the standard reference for the terminology, applied here to the specifics of sequencing.
Key Takeaways
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What IQ, OQ, and PQ Cover
The qualification model has four phases, though the middle three carry the familiar names. Design qualification (DQ) comes first and is performed before purchase: it defines the functional and operational specifications the instrument must meet for its intended use, which is precisely the written requirement a sound selection process produces. The three qualification phases that follow are performed at and after installation, and each has a distinct, specific meaning.
Phase | What It Establishes | For a Sequencer, This Means |
IQ | The instrument was delivered as specified and correctly installed in its environment | Confirming the instrument, components, software version, and installation match the specification and the site is suitable |
OQ | The instrument functions according to its operational specification in that environment | Verifying the instrument’s functions, controls, and software operate within specification after installation |
PQ | The instrument consistently performs to the user’s specifications for the intended use | Demonstrating the instrument produces sequencing data meeting defined quality metrics on a known control sample |
Table 1. The three qualification phases as they apply to a sequencing instrument, following the USP <1058> framework. A prior design qualification (DQ) defines the specifications before purchase.
The order is not arbitrary. Installation qualification must come first, because operational and performance qualification depend on it; you cannot verify an instrument functions to specification until you have established it was installed correctly. Each phase builds on the one before, and together they move from "the right instrument arrived and is set up properly" through "it works as specified" to "it reliably does the actual job we need it to do."
Vendor-Supplied vs. Lab-Written Protocols
Most sequencing vendors offer IQ and OQ as a paid service at installation, using their own protocols and documentation, and this is usually the sensible way to handle those two phases. The vendor knows the instrument’s specifications and has standardized test packages, and having the manufacturer document that the instrument was installed and functions correctly is both efficient and credible. Whether to purchase the vendor’s qualification service is a question to settle during procurement, alongside the service contract terms covered in Service Contracts, Uptime, and Total Cost of Ownership for Sequencers.
There is one responsibility a vendor package does not remove. Under the qualification framework, when a lab uses test packages supplied by a vendor or service provider, the lab must still review them to confirm they are scientifically sound and actually cover the instrument’s intended use in that lab. A generic vendor OQ may verify the instrument meets its own operational specification without confirming it meets your specific application requirements. The vendor documents that the instrument works as the vendor defines working; the lab remains accountable for confirming it works as the lab needs it to. That review is not a formality, and in a regulated setting it is itself part of the record.
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Performance Qualification for Sequencing Runs
Performance qualification is where sequencing differs most from simpler instruments, and it is usually the phase the lab owns rather than the vendor. IQ and OQ can largely confirm the instrument itself is correct and functional. PQ has to demonstrate something more specific and more meaningful: that the instrument, in your hands, with your workflow, consistently produces sequencing data that meets defined quality criteria. That is a statement about the whole process, not just the hardware.
In practice, performance qualification for a sequencer means running one or more known control samples, materials with an established expected result, and confirming the output meets predefined acceptance criteria on the quality metrics that matter for your applications. The criteria have to be defined in advance, because a result you evaluate against standards chosen after you see it proves nothing. What the metrics and thresholds should be depends on the applications the instrument serves, and defining them connects directly to the assay validation work that regulated methods require, covered in Validating an NGS Assayfor Clinical Use.
PQ Proves the Process, Not Just the MachineAn instrument can pass installation and operational qualification, confirming it was set up correctly and functions to specification, and still fail to produce acceptable data in routine use because of factors qualification of the hardware alone never touches: library preparation, sample quality, operator technique, and the analysis pipeline. Performance qualification on a known control sample is the step that catches this, because it tests the instrument doing the actual job under real conditions. It is the phase most worth investing in carefully, and the one a rushed installation is most likely to shortcut. |
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Requalification After Service or Relocation
Qualification is not a one-time event that stays valid forever. Certain changes to the instrument or its situation invalidate part or all of the original qualification and require requalification, and the discipline is to define these triggers in advance so the decision is made by policy rather than improvised under pressure. The qualification framework is explicit that relevant parts of installation qualification apply again when an instrument is moved to another location or reinstalled, and that changes to the system flow through to the operational and performance qualification tests affected by the change.
Three triggers are worth writing into policy. Relocation: moving the instrument, even within a building, changes its environment and installation and calls for at least partial requalification. Major service or component replacement: a significant repair or a replaced major component can affect performance and may require re-running the relevant operational and performance tests, which is one reason the service records covered earlier matter. And significant change: a major software or firmware upgrade, or a change in intended use, can invalidate prior qualification for the affected functions. Deciding in advance what level of requalification each trigger demands turns a potentially disruptive judgment call into a documented, defensible procedure.
Documentation to Retain
The documentation is the point, especially for the hook that makes this whole exercise worth timing correctly. Qualification that happens but is not documented to a retainable standard delivers little of its value, because the value lives in being able to produce, months or years later, the record of how the instrument was installed, how it functioned, and how it performed at the start. Retain the qualification protocols and their results, the instrument description including model, serial number, and software version, the installation and environmental confirmation, the operational test results, the performance qualification data and its acceptance criteria, and the record of who performed and approved each phase.
This is where the timing argument becomes concrete. Capturing this documentation as qualification happens, at installation, adds little to the effort already underway. Reconstructing it afterward, when a regulated study or an accreditation application suddenly requires evidence the instrument was qualified, ranges from expensive to impossible, because some of the information, the state of the instrument at installation, simply cannot be recreated after the fact. A research lab that keeps minimal but real qualification documentation from day one preserves the option to support regulated work later at almost no additional cost. A lab that skips it forecloses that option quietly, and only discovers the foreclosure when it needs the records it never kept.
Expectation | Research-Use Laboratory | Regulated or Accredited Laboratory |
Qualification | Recommended as good practice; establishes a performance baseline | Required |
Vendor IQ/OQ | Optional but usually worthwhile | Expected, with lab review of the packages |
Performance qualification | Advisable on a known control sample | Required, against predefined acceptance criteria |
Documentation retention | Minimal but real records preserve future options | Complete records required and retained per policy |
Requalification | By judgment after major change | By defined, documented triggers |
Table 2. Qualification expectations by laboratory type. Research-use labs benefit from qualification as good practice and future insurance; regulated and accredited labs are required to qualify and to retain the documentation.
Whether required or elective, qualification is the bridge between a newly installed instrument and a dependable one, and it belongs in the plan from the moment the instrument is selected. The full compliance picture that qualification sits within, for labs doing or moving toward regulated work, is covered in Quality and Compliance in NGS Labs: From Research Use to Regulated Testing. The selection process that should define the qualification specifications before purchase is in Choosing an NGS Platform: A Lab Manager’s Selection and Procurement Guide, and the broader operational context is in Next-Generation Sequencing in the Lab: A Manager’s Guide to Building, Budgeting, and Scaling NGS Capacity.
This article was produced under Lab Manager's AI Editorial Guidelines.
