A lab report communicates a scientific experiment clearly enough that another researcher could understand, evaluate and reproduce it. UK science students are marked on structure, precision and the correct use of the scientific format. This complete guide explains the standard lab report structure, the IMRaD model, how to write each section — from aim and method to results and discussion — and the conventions of scientific writing.
What Is a Lab Report?
A lab report is a formal account of an experiment: what you were testing, how you tested it, what you found, and what it means. Its purpose is clarity and reproducibility — another scientist should be able to follow and repeat your work.
The Standard Structure (IMRaD)
✓ Title and abstract — what was done and found, in brief.
✓ Introduction — background, aim and hypothesis.
✓ Method — materials and procedure, in enough detail to reproduce.
✓ Results — data presented in tables and figures.
✓ Discussion — interpretation, comparison with expectations, and errors.
✓ Conclusion and references.
Writing the Method
Write the method in the past tense and usually the passive voice (“the solution was heated”), with enough detail that another student could repeat the experiment exactly. Do not write it as a list of instructions — describe what was done.
Presenting Results
Present data objectively in clearly labelled tables and figures, with units and captions. Report what you found here — calculations, measurements, trends — without interpreting it. Interpretation belongs in the discussion.
Writing the Discussion
The discussion interprets your results: did they support the hypothesis, how do they compare with theory, and what sources of error or uncertainty affected them? Honest analysis of limitations is rewarded. See our discussion guide.
Common Mistakes to Avoid
✓ Mixing results with discussion.
✓ A method too vague to reproduce.
✓ Unlabelled tables or figures.
✓ Ignoring sources of error.
✓ Writing in an informal or first-person style where it is not allowed.
Tips for a Higher Grade
Follow the required structure exactly, write the method so it is fully reproducible, keep results and discussion separate, label every figure, and address errors and uncertainty honestly.
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Frequently Asked Questions
What is a lab report?
A formal account of an experiment covering its aim, method, results and interpretation, written so it can be reproduced.
What is the structure of a lab report?
Title, abstract, introduction, method, results, discussion, conclusion and references.
What is IMRaD?
A scientific structure: Introduction, Methods, Results and Discussion.
What tense should a lab report use?
The method and results are usually written in the past tense, often in the passive voice.
What goes in the results section?
An objective presentation of your data in tables and figures, without interpretation.
What is the difference between results and discussion?
Results report the data; the discussion interprets it and considers errors and implications.
Should I include sources of error?
Yes — identifying and discussing error and uncertainty is expected and rewarded.
How do I write the method?
Describe materials and procedure in enough detail that another person could reproduce the experiment.
Do lab reports use the first person?
Often they avoid it in favour of the passive voice; follow your department's guidance.
How long is a lab report?
It varies with the experiment and brief; clarity and completeness matter more than length.
Related Study Guides
How to Write a Report • How to Write a Methodology • How to Write a Discussion Chapter • How to Write an Abstract
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