Lab Notebook Best Practices: What to Record and How to Structure It
A lab notebook is a legal document, a scientific record, and a practical tool simultaneously. Researchers who keep clear, structured notebooks reproduce their own experiments successfully, defend their intellectual property, and write papers faster. Those who don't spend weeks reconstructing what they did months ago.
What every lab notebook entry needs
Date and researcher name
Every entry, every day. Non-negotiable for GLP compliance and IP protection. In a team environment, entries should be countersigned by a witness who understands the work.
Objective and hypothesis
What are you testing and what do you expect? Written before the experiment. Forces clarity of thought and provides context for interpreting results weeks later.
Materials with lot numbers
Antibody lot numbers, cell passage numbers, reagent batch numbers. These are essential for troubleshooting — a failing assay is often traceable to a lot-to-lot variation in a reagent.
Procedure with in-line observations
Write observations during the experiment, not after. Note anything unexpected: "solution turned yellow on addition" or "centrifuge made unusual noise at step 4." Real-time notes are forensically valuable; retrospective notes are not.
Raw data — never processed
Paste or tape in raw instrument printouts. Record gel images, spectra, and plate reader outputs directly. Raw data should never be altered — if you make an error, cross it out with a single line and note why.
Next steps
What do the results mean? What do you do next? Written while the experiment is fresh.
GLP and regulatory requirements
Under Good Laboratory Practice (GLP) regulations, lab records must be original, contemporaneous, attributable, legible, and complete (ALCOA principles). Electronic lab notebooks (ELNs) must have audit trails, user authentication, and prevent backdating. If your work is intended for regulatory submission (FDA, EMA), confirm your notebook system is GLP-compliant before starting.
Paper vs digital lab notebooks
Paper notebooks remain the gold standard for GLP compliance and are still required by many pharmaceutical companies. Digital notebooks (Benchling, LabArchives, Notion, OneNote) offer searchability, easy sharing, and automatic backups — advantages that paper cannot match. Many labs use both: digital for day-to-day notes and data links, paper for signed witness records.
Generate a lab notebook template
Describe your experiment and the AI generates a complete, structured notebook template — objective, materials, procedure, observations, and results sections, pre-filled for your experiment type.
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