NGS Lab Design and Layout
A clinical NGS lab layout should make contamination hard and good workflow easy. This guide covers how to zone space, move people and samples, and equip each room.
SLC is an independent, nationwide clinical laboratory consulting network. We are not affiliated with, authorized by or endorsed by any sequencing platform maker, kit supplier or accrediting organization.
Core zones
Most clinical NGS labs plan at least these areas, as separate rooms where possible:
Reagent preparation (cleanest; no specimens or nucleic acids)
Specimen processing and nucleic acid extraction
Pre-amplification library setup
Post-amplification: library PCR, cleanup, quantification, pooling
Sequencing instrument room
Server/IT or cloud access point
Unidirectional flow
Personnel, specimens and materials move from reagent prep toward post-amplification, never backward on the same day without documented decontamination. Use dedicated lab coats per zone, and color-code pipettes, racks and consumables.
Air handling
Many labs design pre-amplification rooms with positive pressure and post-amplification rooms with negative pressure relative to the corridor to limit amplicon escape. Confirm HVAC heat load for sequencers, thermal cyclers and servers.
Equipment by zone
Reagent prep: dead-air box or PCR hood, dedicated pipettes, freezer
Extraction: biosafety cabinet, extraction instrument, centrifuge
Pre-amp: PCR workstation, thermal cycler for pre-amp steps if used
Post-amp: thermal cycler, magnetic stands, fragment analyzer, fluorometer, qPCR
Sequencer: stable bench, UPS, network
Utilities and environment
Plan dedicated circuits and UPS for sequencers and freezers, temperature and humidity monitoring with alarms, and network bandwidth for data transfer. Follow each manufacturer's site preparation guide.
Documentation inspectors expect
Floor plan showing zones and flow, SOP for workflow and decontamination, cleaning logs, temperature records, and contamination monitoring results such as no-template controls.
How SLC helps
SLC reviews floor plans, recommends zoning for small footprints, writes workflow and decontamination SOPs, and aligns the design with CAP and CLIA expectations.
Small-footprint options
Not every lab can build four rooms. Where space is limited, labs sometimes combine reagent preparation and pre-amplification work in one room using separate dedicated hoods, and keep post-amplification work strictly in another room. Whatever compromise you choose, document the risk assessment, add controls such as more frequent decontamination and no-template controls, and monitor for contamination.
Doors, airlocks and gowning
Anterooms or airlocks between corridors and molecular rooms help maintain pressure differentials and give a place to change lab coats and gloves. Place coat hooks and glove stations at each room entrance, and post signs describing permitted direction of travel.
Sample and material transfer
Pass-through boxes between rooms let samples move from pre- to post-amplification without staff crossing. Sealed transport containers are an alternative. Nothing returns from post-amplification to pre-amplification areas.
IT and data infrastructure
Sequencers produce large data files that must move reliably to storage and analysis. Plan wired network connections, adequate bandwidth, local buffer storage, power protection for servers and network equipment, and physical security for any on-site compute.
Planning for growth
Leave space and power for a second sequencer, automation and additional freezers. Expanding into a cramped layout later often forces compromises in zoning.
Validating the space
Before validation testing, confirm HVAC performance including pressure relationships if designed, run no-template controls in each area, and check cleaning procedures. Keep these records with your validation package.
Room-by-room checklist
Reagent preparation: no specimens, nucleic acids or amplicons ever enter; dedicated freezer and refrigerator; PCR hood with UV if used; dedicated pipettes and coats
Extraction: biosafety cabinet for primary specimens; extraction instrument; centrifuge with sealed buckets; specimen refrigerator
Pre-amplification: workstation for library setup and enrichment steps before amplification; dedicated thermal cycler if pre-amp steps require it; dedicated consumables
Post-amplification: thermal cyclers for library PCR, magnetic stands, quantification and fragment analysis instruments, pooling bench, amplified library freezer
Sequencer room or bench: vibration-free stable bench, temperature control within manufacturer range, UPS, network
Cleaning and decontamination design
Choose non-porous bench surfaces that tolerate bleach and other decontaminants, avoid open shelving over work areas where dust collects, and plan sinks and eyewash stations so they do not force staff to cross zones. Write cleaning frequencies for each area: work surfaces before and after use, pipettes and equipment weekly or as validated, floors and shared areas on a schedule.
Safety and waste
Plan chemical storage for flammables and corrosives used in extraction and library prep, biohazard waste containers in specimen areas, and sharps containers. Amplified product waste should be sealed and discarded from post-amplification areas only.
Common layout mistakes
Sequencer placed in a pre-amplification room where amplified libraries must be brought in
Shared freezer for reagents and amplified libraries
Single centrifuge used across zones
Lab coat storage only at the main entrance
No space reserved for automation
Temperature, humidity and power
Sequencers, thermal cyclers and fragment analyzers specify operating temperature and humidity ranges, and many generate considerable heat. Install continuous monitoring with alarms in each room and in reagent and library storage, size HVAC for the full equipment load, and put sequencers, freezers and servers on UPS with generator backup where available. Document excursions and their impact assessment.
Biosafety in specimen areas
Primary specimens such as blood, tissue and swabs can carry infectious agents. Open them in a certified biosafety cabinet in the extraction area, follow your bloodborne pathogens exposure control plan, and keep specimen handling out of reagent preparation and post-amplification rooms. Infectious disease sequencing may need an additional biosafety risk assessment for the organisms involved.
How SLC helps
SLC reviews architectural drawings or existing space, recommends zoning and flow, writes workflow and cleaning SOPs, and documents the risk assessment behind any compromise. Plans from $500.
Software: compliance tracking with myLabCompliance
Paper binders and spreadsheets break down once a lab runs multiple instruments, shifts and testing personnel. We recommend myLabCompliance, a web-based CLIA compliance management platform for technical consultants, lab directors, lab owners and quality teams. Its public site describes tools for personnel management, validation, quality control, equipment, document control, scheduling, analytics and audit-ready workflows.
QC logs and quality control records kept in one place
Personnel records and competency tracking
Validation records for new instruments and methods
Equipment records for maintenance and calibration
Document control for SOPs and policies
Scheduling for recurring tasks such as PT events and competency
More NGS resources from SLC
Frequently asked questions
Do I need separate rooms for pre- and post-PCR?
Physical separation is strongly recommended; small labs sometimes use separated hoods with strict procedures, which must be justified and monitored.
Is unidirectional workflow required by CLIA?
CLIA requires procedures that prevent contamination; CAP molecular requirements address physical separation. Exact wording varies by checklist edition.
Can SLC review my floor plan?
Yes, book a free consultation.
Sound Lab Consultants (SLC), PO Box 2135, Chandler, AZ 85244. A nationwide clinical laboratory consulting network. Plans from $500.