An ELN (electronic lab notebook) records experiments as scientists write them up: aims, protocols, observations and conclusions. A LIMS (laboratory information management system) tracks samples, tests and results through structured workflows. ELN vs LIMS is not either-or: research labs lean on the ELN, testing labs on the LIMS, and many run both linked by sample IDs.
- ELN: flexible, experiment-centred records. LIMS: structured, sample-centred workflows.
- Many labs run both and link them by sample, batch or study IDs.
- Records required by FDA rules fall under Part 11 whichever system holds them.
- Check that exports keep audit trails, signatures and attachments, not just text.
What is the difference between an ELN and a LIMS?
The short answer is what each system is organized around.
| ELN | LIMS | |
|---|---|---|
| Organized around | Experiments and projects | Samples, tests and workflows |
| Typical users | Research scientists, discovery teams | QC, analytical, clinical and contract testing labs |
| Data shape | Free text, tables, images, attached files | Structured fields, specifications, results with units |
| Typical records | Aims, protocol, observations, conclusions, signatures | Sample IDs, chain of custody, test results, approvals, instrument links |
| Strength | Captures reasoning and context | Consistency, throughput and traceability |
| Weakness | Hard to query across experiments | Captures little of why a test was run |
What is a LIMS?
A laboratory information management system registers samples, assigns tests, records results against specifications, tracks storage and chain of custody, and routes results for review and approval. It suits labs that run the same methods on many samples: QC, analytical chemistry, bioanalysis, clinical and contract testing.
What is an electronic lab notebook (ELN)?
An ELN replaces the paper notebook. Scientists write up each experiment with its aim, protocol, materials, observations, data files and conclusion, and sign or witness entries. It suits research and development, where each experiment differs from the last and the reasoning matters as much as the numbers.
Do ELN and LIMS records have to meet 21 CFR Part 11?
When an FDA rule requires the record, yes. Part 11 "applies to records in electronic form that are created, modified, maintained, archived, retrieved, or transmitted, under any records requirements set forth in agency regulations" (21 CFR 11.1). Its closed-system controls include validation, accurate copies, access limits and "secure, computer-generated, time-stamped audit trails" (21 CFR 11.10). Under GLP, raw data includes "computer printouts, magnetic media" and "recorded data from automated instruments" (21 CFR 58.3), and it must be archived for retrieval (21 CFR 58.190). Discovery work outside any FDA record requirement is not under Part 11, though good practice is similar.
When do labs use a LIMS and an ELN together?
When research and testing meet: a discovery team designs compounds in the ELN and sends samples to an assay group that runs them through the LIMS. The link is a shared identifier (sample, batch, plate or study ID) carried in both. Without it, results cannot be joined back to the experiment that asked for them. Some products combine both functions; the question to ask is the same: can you join an experiment to its results by ID, and export both together?
Exporting ELN and LIMS records: a worked example
The ELN and LIMS export checklist (CSV) lists what to export from each system and how to check it. The example is invented: a 40-person biotech moving off an ELN and a LIMS before a system change.
| Check | Result (fictional) | Fix |
|---|---|---|
| ELN entries per year | 2019 to 2026, about 4,000 a year; 2021 has 300 | Found a second workspace for 2021 projects |
| Attachments open after export | 9 of 10 sampled open; one proprietary instrument format | Exported vendor-neutral copies alongside the originals |
| Audit trail exported | Only as a separate report | Exported it per entry and kept the report |
| ELN to LIMS join by sample ID | 87% of sampled entries match LIMS results | Recorded the 13% as orphans with reasons |
| Failed experiments present | Yes, tagged "abandoned" in 11% of entries | Kept them in the export |
Common ELN and LIMS mistakes
- No shared sample or study ID between the two systems, so results cannot be joined to experiments.
- Exporting PDFs only, losing structured results, metadata and audit trails.
- Leaving instrument files on local drives, linked from entries by paths that break.
- Deleting or hiding failed experiments during a clean-up.
- Letting sponsor and internal projects share folders with no ownership tag.
- Shared logins, which break signature and audit-trail controls.
Linked ELN and LIMS records are also a data asset
An ELN says why an experiment was run and what the scientist saw; a LIMS says exactly what came out. Joined by sample ID, with the failures kept, they form a record of how research really proceeded.
AI developers working on biology and chemistry ask for experiments like these with their context and their failures. Sponsor-owned studies, partner-restricted projects and identifiable human-subject data stay out unless the agreements and consents allow them; licensing R&D lab notebooks covers the general case.
If your company keeps years of lab notebooks and assay results, the guide for biotechs, CROs and contract labs explains what AI developers ask for and who signs. To see what yours could be worth, describe them in six questions; no files or system access needed.
Common questions
What is the difference between ELN and LIMS?
An ELN records experiments the way scientists write them up: aims, protocols, observations and conclusions. A LIMS tracks samples, tests and results through structured workflows. Research labs lean on ELNs, testing labs on LIMS, and many use both.
What is a LIMS used for?
To register samples, assign tests, record results against specifications, track storage and chain of custody, link results to instruments and route them for review and approval. It suits labs that run standard methods on many samples.
Do you need both an ELN and a LIMS?
Not always. A pure research group may need only an ELN, and a routine testing lab only a LIMS. Labs that design experiments and run many samples usually need both, linked by a shared sample or study ID.
Are ELN records subject to 21 CFR Part 11?
When an FDA regulation requires the record, such as GLP raw data, yes: Part 11 applies to electronic records kept under agency record requirements. Early discovery work outside any FDA requirement is not, though the same controls are good practice.
Is an electronic lab notebook legally valid?
For FDA-regulated records, electronic records and signatures that meet Part 11 are treated as equivalent to paper. For patents or disputes, what matters is that entries are dated, attributable and protected from undetected change, which a validated ELN with an audit trail provides. Patent counsel decides what evidence a court or patent office will need.
How do you export data from an ELN or LIMS?
Use the native export or API to get structured data, attachments and audit trails, not only PDFs. Then check counts by year, open a sample of attachments, confirm signatures and audit trails came across, and join a sample of ELN entries to LIMS results by ID.
What should a lab check before switching ELN or LIMS?
That the old system's full history, audit trails, signatures and attachments can be exported and read without it, that GLP and Part 11 records stay retrievable for their retention period, and that sponsor and partner projects are tagged.
Sources and further reading
Origin Data Partners is an independent data partner. We work with buyers, and a buyer may pay us when a deal closes.
- 21 CFR 11.1: scope of Part 11 (electronic records and signatures)
- 21 CFR 11.10: controls for closed systems
- 21 CFR 58.3: definitions (nonclinical laboratory study, sponsor, raw data)
- 21 CFR 58.190: storage and retrieval of records and data
- FDA guidance: Part 11, Electronic Records; Electronic Signatures, Scope and Application