Lab Report Help: How to Write a UK University Lab Report Guide
Last updated: November 2026 · Reviewed by the HND Assignment Help tutoring team
Quick answer
A lab report at a UK university or college records a practical experiment in a fixed scientific structure: title, abstract, introduction with aim and hypothesis, method, results, discussion, conclusion and references. You submit a written report (often 1,500–2,500 words, check your brief) with labelled tables and graphs of your own data. Marks usually concentrate on accurate results presentation, a discussion that explains findings using theory and evaluates errors, and a method clear enough to be repeated.
This guide is for students writing lab reports in biology, biomedical science, nursing and health science, sport science, chemistry and engineering foundation modules, including Pearson BTEC HNC/HND Applied Science and Access to HE courses. It shows how to approach each section, how to present data and how assessors mark the work. Always follow your module brief, because departments vary.
Lab report at a glance
| Item | Detail |
|---|---|
| What it is | A formal scientific write-up of a practical you carried out |
| Typical length | Often 1,500–2,500 words for first and second-year modules (check your brief) |
| Standard sections | Title, abstract, introduction, method, results, discussion, conclusion, references, appendices |
| Data presentation | Numbered tables (title above) and graphs (caption below) with units and error bars where appropriate |
| Writing style | Formal, usually past tense and impersonal (“the sample was heated”) |
| Where the marks sit | Results and discussion usually carry the largest share; check the rubric |
Section-by-section approach
Title and abstract
The title should say what was measured and under what conditions. The abstract (about 150–200 words) is written last and summarises aim, method, key result with numbers, and main conclusion in one paragraph.
Introduction
Move from general theory to your specific experiment. Explain the scientific principle, cite two to five reliable sources (textbooks, peer-reviewed papers), then end with a clear aim and a testable hypothesis.
| Part | What to include | Typical length |
|---|---|---|
| Background theory | Key concept, with citations | 2 short paragraphs |
| Rationale | Why this experiment matters or what gap it tests | 1 short paragraph |
| Aim | One sentence starting “To investigate…” | 1 sentence |
| Hypothesis | Testable prediction, with a null hypothesis if required | 1–2 sentences |
Method
Write in past tense, impersonal style, in enough detail for someone to repeat the experiment. Include materials, equipment, quantities and units, the procedure in a logical order, controls, repeats and any safety or ethical considerations. Many departments allow you to refer to a lab manual rather than repeating every step: check your brief.
Results
Present processed data, not every raw reading. Use a table for exact values and a graph to show the pattern. State the main trend in one or two sentences, without explaining it.
Worked method example (not an answer)
Imagine an invented practical measuring resting and post-exercise heart rate in 10 volunteers. The results section would show a table with each condition’s mean heart rate and standard deviation, for example 72 bpm (SD 6) at rest and 118 bpm (SD 11) one minute after a step test, a bar chart with error bars, and one sentence stating that mean heart rate rose after exercise. If a statistical test is required, a paired test fits because the same people are measured twice; you would report the test statistic and p-value. The explanation of why heart rate rises would go in the discussion. All figures are invented to show the pattern.
Choosing the right graph
The graph type should match the type of data you collected. A wrong choice is one of the quickest ways to lose presentation marks, even when the numbers are correct.
| Your data | Best graph | Remember to |
|---|---|---|
| Two continuous variables (for example, temperature and reaction rate) | Scatter or line graph with the independent variable on the x-axis | Label both axes with units; add a line of best fit if appropriate |
| Means of separate groups or conditions | Bar chart with error bars (standard deviation or standard error) | State in the caption which error measure you used |
| Change over time | Line graph | Use equal intervals on the time axis |
| Proportions of a whole | Pie chart only if your tutor accepts it; often a table is clearer | Make sure categories add to 100% |
Keep graphs simple: no 3D effects, no unnecessary colours, and a caption that tells the reader what the graph shows. Number every figure and refer to it in the text before it appears.
Discussion
This is where most marks are won or lost. Use a simple sequence for each key result:
| Step | What to write |
|---|---|
| 1. Restate | The main result in one sentence |
| 2. Explain | The scientific reason, linked to theory and citations |
| 3. Compare | With expected values or published data |
| 4. Evaluate | Random and systematic errors, limitations, anomalies and their likely effect |
| 5. Improve | Specific, realistic improvements (not just “repeat more times”) |
Conclusion and references
Two to four sentences answering the aim and stating whether the hypothesis was supported. Then a reference list in the style your department specifies, such as Harvard or Vancouver.
Common mistake
Writing a discussion that only says “the results were as expected” and lists “human error”. Assessors want a scientific explanation using theory, a comparison with expected or published values, and specific sources of error with their likely effect on the result.
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How assessors judge a lab report
| Criterion | What a top-band answer shows | What loses marks |
|---|---|---|
| Introduction and hypothesis | Relevant theory with citations and a clear, testable hypothesis | Copied textbook background with no aim |
| Method | Repeatable, past tense, includes controls and repeats | Recipe-style instructions or missing quantities |
| Results | Processed data in titled tables and correctly labelled graphs with units | Raw data dumps, missing units, unlabelled axes |
| Discussion | Explains findings with theory, evaluates errors specifically, suggests realistic improvements | “Human error” as the only limitation |
| Presentation and referencing | Consistent style, correct figure numbering, accurate references | Mixed styles, no in-text citations |
Pre-submission checklist
- Title states what was measured
- Abstract written last and includes a key number
- Aim and hypothesis stated at the end of the introduction
- Method in past tense with quantities, units, controls and repeats
- Tables titled above, graphs captioned below, axes labelled with units
- Results describe trends without explaining them
- Discussion explains, compares, evaluates and suggests improvements
- Conclusion answers the aim
- References in your department’s style and cited in text
- Word count and format match your brief
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Lab report answer hints and sample structure
A “lab report sample answer” cannot help you much: your marks depend on your own data and analysis, and copied reports are easy to detect. Use this typical structure for a 2,000-word report instead and adjust it to your brief.
| Part | Suggested words | Share of marks (typical) | What to put in it |
|---|---|---|---|
| Title and abstract | 150–200 | Low to moderate | Aim, method, key result, conclusion |
| Introduction | 300–400 | Moderate | Theory, rationale, aim, hypothesis |
| Method | 250–350 | Moderate | Materials, procedure, controls, repeats |
| Results | 250–350 plus tables and graphs | High | Processed data, trends |
| Discussion | 600–800 | Highest | Explain, compare, evaluate, improve |
| Conclusion | 100–150 | Low | Answer the aim |
Mark shares here are typical only; use your own rubric to decide where to spend effort.
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Frequently asked questions
What is the structure of a lab report in the UK?
Most UK lab reports use title, abstract, introduction, method, results, discussion, conclusion, references and appendices. Your module brief may adjust this.
Should a lab report be written in past tense?
Yes for the method and results, because they describe what you did and found. Use present tense for established scientific facts in the introduction and discussion.
Can I use “I” or “we” in a lab report?
Many UK departments prefer an impersonal style, but some now accept first person. Follow your module guidance.
How long should a lab report be?
Commonly 1,500–2,500 words at first and second-year level, but always use the word count in your brief.
What should go in the discussion of a lab report?
An explanation of your results using theory, comparison with expected values or literature, evaluation of errors and limitations, and specific improvements.
Do I include raw data?
Put processed data and summary tables in the results and raw data in an appendix if your brief asks for it.
Can a tutor help with my lab report?
Yes. A tutor can explain the science and statistics and give feedback on structure and clarity. The data, analysis and writing must be your own.
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Academic integrity note: This guide explains how to approach the task. It is not an answer to copy, and nothing here should be submitted as your own work. Our tutors offer one-to-one tutoring, feedback on your drafts and proofreading only, in line with the Skills and Post-16 Education Act 2022 and your university or college academic misconduct policy. Always follow your own brief, marking criteria and your institution’s rules on AI use.