# Lab Notebook Retention Schedules: How Long to Keep Records A [lab notebook](/knowledge/molecular-biology/lab-notebook) is the dated, signed record of what was done in the laboratory. A retention schedule is the rule set that decides how long that record must survive before it can legally be destroyed. The one-sentence difference is that the notebook captures the work and the retention schedule governs whether the work can later be proven. The rule of thumb for choosing how long to keep records is simple. Identify every clock attached to the notebook, which usually means federal grant rules, regulatory rules such as Good Laboratory Practice (GLP, the FDA framework for nonclinical safety studies), OSHA employment rules, and patent strategy. Then keep the notebook until the longest clock runs out, and add a safety margin of a year or two. There is no single federal number that covers every notebook, because different rules attach to different reasons you might need the record again. This article walks through where lab notebook retention requirements actually come from, the retention options available to a lab, a paper versus electronic lab notebook comparison on the criteria that decide real purchases, worked scenarios, and a lab notebook template designed so records remain usable decades later. ## Lab Notebook Retention Requirements at a Glance ![Comparison of grant, GLP, OSHA exposure, CLIA and patent retention periods with what each rule covers.](/article-images/illustrations/lab-notebook-retention-requirements-clock-stack.webp) The best lab notebook retention requirements are not one number but a stack of obligations, and the strictest one in the stack wins. The table below lists the rules that most often determine a retention decision in an American research or industrial laboratory. | Rule source | What it covers | Typical minimum retention | |, - |, - |, - | | Federal grant awards (2 CFR 200.334) | Financial records and supporting documentation, including the lab records behind charges to a federal award | 3 years after submission of the final expenditure report, longer if litigation, claims, audits, or investigations are pending | | FDA Good Laboratory Practice (21 CFR 58.195) | Raw data, protocols, specimens, and records from nonclinical laboratory studies | 5 years at minimum, and longer when the study supports a research or marketing permit, in which case records are kept until at least the period specified for permit-linked studies | | OSHA access to exposure and medical records (29 CFR 1910.1020) | Employee exposure records such as industrial hygiene monitoring and chemical exposure measurements | Preserved and maintained for at least 30 years, generally for the duration of employment plus 30 years | | FDA electronic records (21 CFR Part 11) | Electronic records and signatures used in place of paper records for FDA-regulated work | No fixed number of years, but the regulation requires controls that preserve records and allow accurate, ready retrieval throughout the retention period the underlying rules demand | | Clinical testing under CLIA (42 CFR Part 493, Subpart K) | Patient test reports produced by laboratories regulated under the Clinical Laboratory Improvement Amendments | Test reports retained at least 2 years, with longer periods required for certain specialties such as blood banking | | Patent and intellectual property practice | Conception and reduction-to-practice evidence for inventions, including notebook pages and witnessed entries | No federal minimum, and common practice is to keep records through the life of any resulting patent plus a dispute buffer, often decades | | Publication, collaboration, and data sharing expectations | Raw data supporting published papers and shared datasets | Varies by funder, journal, and institution, and many institutions ask researchers to retain supporting records for the useful life of the publication | Two consequences of this stack are worth spelling out. First, a notebook used on a federally funded project cannot be thrown away three years after the project ends if the same notebook also contains GLP raw data, because the five-year GLP clock still runs. Second, OSHA exposure records have no practical relationship to project timelines, so a notebook that documents an employee's personal chemical exposure lives on a completely different clock from the experiment described on the same page. This is why serious institutions maintain formal lab notebook retention schedules by record type rather than by project. ## Where Lab Notebook Retention Schedules Come From ### Federal Grant and Funding Rules When a project is charged to a federal award, the records supporting those charges become award records. The Uniform Guidance requires financial records and supporting documentation for federal awards to be retained for three years from the date the final expenditure report is submitted, and the retention period extends if litigation, a claim, an audit, or an investigation starts before the three years expire. For a researcher, the practical meaning is that the notebook pages behind a grant-related purchase or a salary charge are part of that documentation. Universities translate this into policy, and most institutional research offices instruct investigators to keep records for the award period plus at least three years, with extensions during audits. Funders also shape retention through data sharing and preservation policies. The National Institutes of Health expects investigators to retain and share scientific data resulting from funded research, and the agency's guidance on scientific record keeping emphasizes that records supporting published findings should be preserved long enough to permit reproducibility, verify priority, and respond to questions about the work. A notebook that contains only a citation to a deleted dataset no longer serves that purpose. ### Regulatory Rules for Regulated Work GLP applies to nonclinical laboratory studies submitted to the FDA in support of applications for research or marketing permits. Under 21 CFR 58.195, raw data, protocols, specimens, and records from those studies must be retained for at least five years, and records supporting an application are kept for the longer period tied to that application. Raw data in GLP has a precise meaning: any laboratory worksheets, memoranda, notes, and exact copies that are the result of original observations and activities of a study. Your notebook pages are raw data if the study is GLP. Electronic work changes the retention mechanics rather than the duration. If a lab uses electronic records instead of paper records to satisfy FDA requirements, 21 CFR Part 11 applies, and the regulation requires a closed system with secure access, accurate copies for both human and electronic inspection, an audit trail that records the date and time of operator entries, and controls that preserve records and enable ready retrieval throughout the retention period. In plain language, an ELN in a regulated lab must be able to show every entry, every change, who made it, and when, for as long as the paper record would have been kept. Clinical laboratories operate under CLIA, and the retention table there is specialty specific. Patient test reports must be retained at least two years, and laboratories with blood banking or other specialized functions face longer requirements for those records. Notebooks and worksheets that document instrument calibration, quality control, and test performance feed those report records, so the two-year minimum for reports rarely describes the full scope of what a clinical lab keeps. ### Employment and Safety Records OSHA's access-to-records standard requires employers to preserve and maintain employee exposure records and medical records for at least 30 years. Exposure records include monitoring data that measures a worker's contact with a hazardous chemical, noise, or radiation. If a lab notebook page records that a particular employee ran an ether extraction on a particular date under conditions relevant to personal exposure monitoring, that page has become part of an exposure record, and its clock is employment plus 30 years, not project end plus anything. The OSHA Laboratory Standard (29 CFR 1910.1450) requires a written chemical hygiene plan and employee training records, and while the plan itself does not carry a 30-year requirement, the monitoring data generated in connection with it falls under 1910.1020. Many industrial labs therefore keep health and safety pages of notebooks in a separate, long-retention archive. ### Intellectual Property and Patent Records Patent law no longer requires a notebook to prove you were first, because the United States moved to a first-inventor-to-file system under the America Invents Act of 2011. Notebooks still matter enormously. They establish inventorship, document conception and reduction to practice, provide evidence for derivation proceedings, and support defense against claims that an invention was independently conceived elsewhere. They also support trade secret protection, which can last indefinitely as long as the secret remains secret. Because trade secrets can last indefinitely and patents last up to 20 years from filing, there is no retention schedule a notebook owner can safely derive from patent law alone. Common industrial practice, reflected in institutional notebook policies, is to retain invention records through the life of any patent that results from the work and for a dispute period afterward. A conservative lab notebook retention schedule for IP purposes runs well past two decades. ### Institutional and Publisher Policies On top of these external rules, every institution layers its own schedule. Universities typically publish a records retention schedule listing record classes and their minimum periods, and laboratory notebooks almost always appear as a permanent or long-term class because of the mix of grant, safety, and IP obligations described above. Publishers and repositories set data availability policies for published papers. When you cannot locate a specific rule, the institutional schedule is the right starting point, and the records manager or compliance office can identify which external clocks apply to your record class. ## Paper Lab Notebooks vs Electronic Lab Notebooks: Pros and Cons Retention requirements differ by medium because the failure modes differ by medium. A paper notebook survives power outages and vendor shutdowns but cannot be searched. An ELN is searchable and timestamped but depends on an export path and a vendor that stays in business. When researchers compare lab notebook retention requirements options across media, the comparison usually looks like this. | Criterion | Paper notebook | Electronic lab notebook (ELN) | Hybrid (paper plus scan) | |, - |, - |, - |, - | | Legal acceptance | Long history of acceptance, and originals carry strong evidentiary weight | Accepted under 21 CFR Part 11 when validation, audit trail, and signature controls are in place | Scan accepted as a working copy, with the paper original still the record of choice for IP | | Retrieval across the retention period | Manual, page by page, and degrades with age | Instant search by experiment, reagent, date, or author, which Part 11 calls ready retrieval | Good if the scan is full text searchable | | Audit trail | None beyond signatures and dates, which allows undetected backdating | Automatic, timestamped, and tamper evident | Inherited from the paper original | | Vendor and format risk | None, but paper is vulnerable to fire, water, and pests | Real risk of lock-in, and the lab needs a periodic export in an open format | Moderate, since the paper original backs the scan | | Cost profile | Low per-unit cost, but storage and archiving grow with volume | Subscription plus infrastructure, and enterprise deployments carry implementation costs | Both the paper storage and the digital storage | | Fit for regulated work | Straightforward, since GLP raw data rules were written around paper records | Requires Part 11 validation and vendor documentation before use in FDA-regulated studies | Used during transitions, and regulators generally expect the validated system to be the record | The pros and cons in prose form are short. Paper wins on evidentiary tradition, simplicity, and independence from any vendor. It loses on search, collaboration, and disaster exposure. An ELN wins on search, audit trails, and controlled sharing, and it is effectively mandatory where the volume of experiments makes paper archiving impractical. It loses on vendor dependence and the validation work required to use it for regulated records. The hybrid keeps paper originals for IP and evidentiary purposes while gaining searchability, and it is the standard recommendation for labs migrating from paper without a regulated reason to go fully electronic. ## Retention Options: Keep, Scan, or Destroy ### Physical Archive of Originals The default and safest option is to retain the original notebook in a controlled archive. Originals in a bound, numbered, signed notebook remain the gold standard for priority disputes and for GLP raw data. Archive practice matters more than shelf space: notebooks should be indexed by owner, project, and date range, stored away from water and fire risks, and logged out only with a signature. An archive without a checkout log is an archive that cannot prove who touched a record during a dispute. ### Scan and Store Scanning creates a working copy that satisfies most internal retrieval needs and most funder data sharing requests, and it protects the content if the physical original is damaged. A scan does not automatically become the legal record. For GLP raw data, exact copies of raw data are permitted under the regulation, but the copies must be verified as exact, which means a controlled, documented scanning process with verification steps. For patent purposes, institutions generally keep the original regardless of scan quality. ### Certified Destruction ![Decision path asking whether every retention clock has expired, whether any matter is pending, and whether the institution has authorized destruction.](/article-images/illustrations/lab-notebook-retention-requirements-destroy-triage.webp) Destruction is a records management action, not a cleanup task. Before any notebook leaves active retention, the owner should confirm three things in writing. Every external clock must have expired, including grant, regulatory, and IP clocks. No litigation, audit, investigation, or data request touching the work can be pending, because pending matters suspend grant retention periods. And the institution's records manager or compliance office must authorize the destruction, because in most organizations the notebook belongs to the institution, not the individual. Records of the destruction itself, listing what was destroyed, when, and under what authorization, are then kept permanently. ## Worked Retention Scenarios ### Scenario 1, A Graduate Student on a Federal Training Grant Priya keeps a bound notebook for a project funded through her advisor's NIH award. Her page records protein purification conditions and also one entry showing she personally handled a solvent at a measured concentration that her university's environmental health office logged as an exposure record. Her retention clocks are the grant clock, three years after the final expenditure report, the institutional policy classing notebooks as long-term records, and the OSHA exposure clock of employment plus 30 years. Her notebook must therefore outlive her PhD by decades. She also plans to publish, so the supporting data must remain available for reproducibility and review. She keeps the original in her departmental archive and scans every page before leaving. ### Scenario 2, A GLP Study in a Contract Research Organization Marcus writes raw data in a GLP study supporting a drug application. Under 21 CFR 58.195 the raw data must be retained for at least five years, and because the study supports a regulatory application, the record lives until the longer permit-linked period expires. The company also runs the study electronically through a Part 11 compliant ELN, so the system must preserve those records and allow ready retrieval for as long as the retention period lasts. When the retention period ends, the archive index is updated and destruction proceeds only through the company's certified destruction process. ### Scenario 3, A Startup Building Toward Patents Elena's team keeps witnessed notebooks during development of a sensor platform. There is no federal grant, so the three-year grant clock never starts. But the team expects to file patent applications, and trade secrets in the notebooks could be protected indefinitely. Their schedule is conservative: invention notebooks are retained through the full patent term and for ten years beyond, reviewed by counsel before any destruction. They scan pages for searchability but keep the originals because witnessed paper entries carry the strongest evidentiary weight for inventorship questions. ### Scenario 4, A Hospital Clinical Laboratory Daniel's lab reports patient results under CLIA. Test reports must be retained at least two years, with longer specialty-specific periods for blood banking records. The worksheets and instrument logs behind those reports are retained to match the reports they support, and his institution's schedule classifies them together so no report outlives its supporting record. When the laboratory switches reporting systems, the old system's records are exported into a format the lab can retrieve on demand, preserving the ready retrieval expectation for the remainder of each retention period. ## Building a Lab Notebook Template That Survives Retention A retention schedule only matters if the record is still legible, attributable, and complete when the clock is checked. A lab notebook template built for long retention includes the following elements, whether on paper or in an ELN. 1. A header with the experiment title, project or grant number, and the full date on every page or entry. Grant numbers matter because they link the page to the three-year award clock. 2. Continuous page numbering, with bound or system-enforced numbering so pages cannot be removed without evidence. 3. Objective entries written as the work happens, including what was done, reagent identities and lot numbers, instrument identifiers, and the results observed. 4. Corrections made by a single line strike-through, with the correction initialed and dated, never with correction fluid or deletion, because a destroyed original entry undermines the record's evidentiary value. 5. Signature and date at the end of each entry, plus a witness signature for invention-related work, since witnessed entries support inventorship and trade secret claims. 6. Cross references to related records, such as file names, instrument log IDs, and sample barcodes, so the notebook remains the index to the full data package. 7. No blank lines or blank pages left open between the end of one entry and the start of the next, closed out with a strike-through line and initials. In an ELN, the template is a structured entry form that captures the same fields, and the system adds the timestamp and audit trail automatically. The content requirements, reagent identity, conditions, observations, and attribution, are identical across media, which is why a good lab notebook template transfers cleanly from paper to electronic. ## Common Mistakes and Limitations Several specific mistakes account for most retention failures in real laboratories. **Treating the project end date as the retention clock.** Project timelines and retention clocks are different things. A project can end the day its grant closes, and the grant record clock runs three more years from the final expenditure report, while any GLP, CLIA, or exposure element of the same notebook runs five years, two years or more, or thirty years on its own schedule. **Assuming publication replaces the notebook.** A published paper describes the work but rarely contains the raw data behind it. The supporting records must still exist to answer review questions, correct errors, and support reproducibility. **Scanning and then destroying the original without authorization.** A scan is not automatically the record, and for GLP raw data the copy must be verified as exact through a controlled process. Destroying an original before the institution authorizes it can compromise both patent evidence and regulatory compliance. **Letting a departing researcher take the notebook.** In most institutions the notebook is institutional property, and the record must stay in the archive where the retention schedule, the audit trail, and any future dispute can reach it. **Skipping the export path for electronic records.** An ELN subscription that ends without a full export leaves records stranded. Part 11 requires the ability to produce accurate copies throughout the retention period, which means exporting to a stable, readable format on a set schedule, not when the contract is about to lapse. **Destroying during a pending matter.** Any audit, investigation, litigation, claim, or formal data request touching the work suspends normal retention timelines for grant records, and prudence extends the same pause to every other record class. **One limitation.** This article describes general retention frameworks and common institutional practice. Individual questions about a specific record, dispute, audit, or invention belong with your institution's records manager, compliance office, or legal counsel, because the exact clocks that apply depend on facts this article cannot see. ## Frequently Asked Questions ### How long should I keep a lab notebook after a project ends? Keep it until every applicable clock expires, which in most cases means longer than the project. Federal grant documentation runs three years after the final expenditure report, GLP raw data runs at least five years, and exposure records run employment plus 30 years. ### Can I destroy lab notebooks once the data are published? No, not automatically. Publication satisfies scientific communication but not the record retention obligations behind the work, and funders expect supporting records to remain available for reproducibility and review. Wait until grant, regulatory, and IP clocks have all expired and the institution has authorized destruction. ### Are electronic lab notebooks legally accepted? Yes, when they meet the controls for the work. For FDA-regulated records, 21 CFR Part 11 requires secure access, an audit trail, accurate copies, and the ability to retrieve records throughout the retention period. A consumer note-taking app without those controls does not qualify for regulated work. ### Who owns the lab notebook, the researcher or the institution? At most universities and companies, the institution owns the notebook and the researcher has access rights. This is why records must remain in the institutional archive rather than leaving with the author, and why destruction requires institutional authorization. ### What is the shortest safe retention period if nothing special applies? When no grant, regulatory, or IP obligation attaches, the practical minimum is the longest relevant clock you can confirm, which for a plain project notebook is often the institution's standard research record class. A conservative default of several years covers the three-year federal grant floor that applies to most academic work. ### Should I scan old notebooks, and does a scan count as the record? Scanning is valuable for search, sharing, and disaster protection, and it is usually the right first step for a paper archive. The scan is generally a working copy. For GLP raw data the copy must be verified as exact through a controlled process, and for patent evidence institutions keep the witnessed original.