How to Write Better Lab Notes: Best Practices for Modern Research
Whether you’re just starting your PhD or have been working in the lab for years, good lab notes are one of the most valuable tools you have.
Well written notes make it easier to reproduce experiments, understand unexpected results, and pick up where you left off after days, weeks, or even months. They also save time when preparing reports, writing papers, or discussing your work with supervisors and collaborators.
Unfortunately, keeping good lab notes is a skill that many researchers have to learn on their own.
In this guide, we’ll go through the key principles of writing clear, useful, and consistent lab notes that will make your research easier to manage in the long run.
1. Record What Actually Happened
One of the most common mistakes researchers make is writing down what they planned to do instead of what actually happened.
Experiments rarely go exactly as planned. A reagent runs out, an incubation takes longer than expected or a protocol needs to be adjusted halfway through. Those small deviations often feel insignificant in the moment, but they can end up explaining your results weeks or even months later.
Instead of copying your protocol into your lab notes, focus on documenting what actually happened. Write down the changes you made, anything unexpected you observed and any issues that might be worth remembering. Your notes do not need to tell the story of a perfect experiment. They need to tell the story of the experiment you actually performed.
2. Write for Your Future Self
It is easy to assume you will remember why you made a certain decision or what happened during an experiment. In reality, even a few weeks can be enough to forget important details.
When writing lab notes, imagine you are reading them for the first time six months from now. Would you understand what you did and why you did it?
A little extra context goes a long way. Briefly explain the purpose of the experiment, why you chose a particular method or condition and any decisions you made along the way. Your future self will appreciate having enough information to pick up exactly where you left off.
3. Include Photos Whenever They Add Value
A picture can often capture details that are difficult to describe with words alone.
Whether you are documenting a cell culture, a gel, a microscope image or the setup of an experiment, photos provide valuable context and make it much easier to revisit your work later.
Useful images might include:
- Experimental setups
- Microscopy images
- Gels and blots
- Handwritten sketches or calculations
- Unexpected observations
Text explains what happened, but images often capture details you did not realise would matter until much later.
4. Be Consistent
You do not need pages of notes after every experiment. What matters more is that you record information in a consistent way.
Using the same structure for every entry makes it much easier to compare experiments, find specific information and understand your progress over time. Whether you prefer headings, templates or a digital notebook, consistency is what turns a collection of notes into a reliable research record.
5. Don’t Leave Out Failed Experiments
Some of the most valuable lessons in research come from experiments that did not work.
It can be tempting to move on and forget a failed experiment, especially when the result was not what you expected. However, documenting those attempts helps you avoid repeating the same mistakes and often provides clues that become useful later.
Instead of simply writing “failed”, take a minute to record what you expected to happen, what actually happened and any ideas about what might have gone wrong. Those notes can save you from repeating hours or even days of work.
6. Keep Everything Together
Modern research generates far more than written notes. Every experiment can produce images, spreadsheets, PDFs, presentations and other supporting files.
When those files end up scattered across different folders, cloud drives and notebooks, finding what you need quickly becomes frustrating.
Keeping everything related to an experiment in one place makes it much easier to revisit your work, understand the full context and build on previous results. The less time you spend searching for information, the more time you can spend doing research.
Conclusion
Good lab notes are not about writing more. They are about making your research easier to understand, reproduce and build upon.
Whether you prefer a traditional notebook or a digital solution, the most important thing is to develop a consistent system that works for you and stick with it.
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