A lab notebook is the primary record of your research. Done well, it’s a tool that helps you think, makes your work reproducible, and protects intellectual property. Done poorly, it’s a graveyard of half-remembered experiments and lost data.
Why notebooks matter
- Reproducibility: You or someone else needs to repeat the experiment in 6 months
- Intellectual property: Patent disputes turn on first-to-invent or first-to-file documentation
- Regulatory compliance: GLP, GCP, and many other standards require documented records
- Career continuity: When you leave a lab, your notebook is what your successor inherits
- Personal memory: You will not remember why you used 5 mM instead of 10 mM in 3 months
What to include in every entry
Header
- Date
- Project / experiment number
- Title (descriptive enough to find later)
- Hypothesis or question
Materials
- Cell lines (with passage number)
- Reagents with vendor, catalog number, and lot
- Equipment (instrument IDs)
- Plasmids or constructs (with version numbers)
Methods
- Reference to a standard SOP or paper, with explicit notes about any deviations
- Specific concentrations, volumes, and times
- Buffer recipes if non-standard
Results
- Raw observations — measurements, images, gels
- Calculations with units
- References to primary data files
Interpretation
- What the results mean in context
- Issues or unexpected outcomes
- Next steps
Paper vs electronic lab notebooks
| Property | Paper | Electronic (ELN) |
|---|---|---|
| Search | Manual | Full-text |
| Sharing | Hard | Easy |
| Backup | Risky | Automatic |
| Attachments | Tape and staple | Embed natively |
| Legal validity | Strong tradition | 21 CFR Part 11–compliant ELNs are accepted |
| Cost | Cheap | License fee |
Common ELN platforms: Benchling, LabArchives, eLabFTW (open source), Sapio Sciences. Most large pharma have used ELNs for over a decade; academic adoption has accelerated.
The “future you” test
Read your notebook entry as if you were a colleague trying to repeat the experiment in 6 months without talking to you. Could they?
- Do they know which cells, what passage, what media?
- Do they know exact volumes, times, and conditions?
- Do they know what controls were run?
- Do they know where the raw data files are?
- Do they know what was different from the standard SOP?
Best practices
- Write contemporaneously — at the bench, not from memory afterward
- Permanent ink only in paper notebooks (no pencil or erasable)
- Cross out errors with a single line — never erase or use white-out
- Sign and date each page in paper notebooks; ELNs do this automatically
- Have notebooks witnessed for IP-sensitive work — typical practice in pharma
- Tape in printouts and gels securely with notes on each one
- Reference data files by full path, including server location
- Use consistent naming conventions for files and projects
- Keep a separate “ideas” notebook for thoughts that aren’t tied to specific experiments
Common mistakes
- Writing summaries instead of raw observations
- Recording only successful experiments — failures are scientifically valuable
- Using shorthand only you understand
- Forgetting to document deviations from SOPs
- Not noting reagent lot numbers — critical for tracing failures
- Working from memory and “writing it up later” — this never happens
Notebook organization
- Numbered pages (paper) or systematic IDs (ELN)
- Table of contents updated as you go
- Cross-references to earlier experiments
- Tags or categories for easy retrieval
- Project sections for multi-month efforts
Long-term retention
- Academic: Typically 5–10 years after publication
- Industry: Often the lifetime of the IP plus 5+ years
- GLP/GCP studies: Defined retention periods per regulation
The best lab notebooks aren’t fancy — they’re consistent, complete, and honest. Write for the person who will need to repeat your work, including the version of you who hasn’t thought about this experiment in three months.
