Key points
- Read each result against the range and units printed on the same report, and follow a trend at the same lab.1
- A result outside the range may or may not signal a problem, and a result inside it is not always a guarantee of good health.1
- In a US survey of patients and care partners, 95.3% of those whose results were not normal still preferred to see them immediately.4
- A wai Profile explains your own results in plain language, grounded in your record and current evidence, with a clear line to a clinician.5
Summary
Read a lab report line by line, checking each result against its own reference range and units, and treat a flag as a note on where the number sits. Most ranges cover the central 95% of healthy people, so a result just outside one is common, and your clinician interprets it alongside the rest of your health.
You understand every line of your report and arrive at your appointment with the questions that matter. It takes a few minutes once you know the structure, line by line, then the questions that turn a page of numbers into a plan with your clinician.
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| On the report | What it tells you | What to check |
|---|---|---|
| Patient name and identifier | That the report belongs to you | Name, date of birth and any patient number |
| Laboratory and report date | Who ran the test and when | The date matches the sample you gave |
| Test performed and specimen | What was measured, and from which sample | The specimen is the one you expected |
| Result and unit | The measured value | Compare only with a range in the same unit |
| Reference range | The span seen in most healthy people | The range printed on this report, from this lab |
| Flag, such as H or L | Where the result sits against the range | Ask what it means for you |
| Word results | Whether something was found | Positive, negative or inconclusive, and whether a repeat is planned |
| Specimen notes | A sample that did not meet the lab's criteria | Whether the test needs repeating |
What every lab report contains
US laboratory rules require a test report to identify the patient, name the laboratory and its address, and give the report date, the test performed, the specimen source where relevant, and the result with its units of measurement where applicable.3 Reference ranges set by the laboratory that ran the test must be available to the person who ordered it.3
Read in that order. Check the report is yours, check the date and specimen, then read each result against its own range and units.
What a reference range means
Laboratories traditionally define normal for most tests as the central 95% of a healthy population, which places 2.5% of healthy people above the range and 2.5% below it.2 MedlinePlus notes that healthy people sometimes have results outside the reference range, and that a result inside it is not always a guarantee of good health.1
Some tests have separate ranges for different groups, such as children and adults.1 Results also vary with age, sex, medical history and general health, and your own results can vary from day to day.6
Units and flags
Units vary by test, such as micrograms per decilitre or micromoles per litre, and methods vary by laboratory. MedlinePlus advises against comparing results from different labs and suggests using the same lab to follow a trend.1
Many reports mark a result above its range with H and below with L. The flag shows where the number sits against the range, and your clinician reads it against the rest of your health.
Some results are words, such as positive or negative, and an inconclusive result is usually followed by a repeat test.1
What can move a result
MedlinePlus lists factors that can affect a result, including certain medicines and supplements, hard exercise before the test, a menstrual period, and whether preparation instructions such as fasting were followed.1 Tell the clinician about any of them before the sample is taken.
Seeing results before your clinician does
In a 2022 survey of 8,139 patients and care partners at four US academic medical centres, 95.7% of those who answered preferred to receive results immediately through their portal, including 95.3% of those whose results were not normal.4
Only 7.5% said reviewing results before hearing from a clinician increased their worry, rising to 16.5% among those with abnormal results.4 In the US, laboratories may also give completed reports directly to patients on request.3
Questions to ask your clinician
Take each flagged result in turn and ask what it means for you, whether it has changed since your last test, whether anything you took or did beforehand could explain it, whether it needs repeating, and what happens next.
If a result worries you, contact the clinician who ordered the test. If you feel seriously unwell, call your local emergency number without waiting for an appointment.
Answers about your own results
A wai Profile keeps each result on one timeline with your letters and wearable readings, so a value is read against your own history.5 Ask about a result and you get an understandable answer grounded in your record and current evidence, with citations and a clear line when it is time to see your clinician.5
Interpretation and treatment stay with your clinician. You can open your wai Profile today, and keeping results from several labs together is covered in how to combine health records from different clinics.
Where to start
Open your most recent report and check the name and the date, then go line by line and note each result with its unit and range, marking anything flagged.
Write your questions beside the flags and take them to your next appointment with the appointment preparation guide. Ask the clinic to send future results to your own record, and each new report sits beside the last, ready to compare.
Set up your wai Profile and keep every result on one timeline, with plain-language answers grounded in your own record.
Frequently asked questions
Does a result outside the reference range mean something is wrong?
Not necessarily. Healthy people sometimes have results outside the range, and your clinician looks at other information about your health to understand it.1
Why does my report show a different range from a friend's?
Ranges are set by each laboratory and can differ by group, such as children and adults.1 Compare your result only with the range on your own report.
Can I compare results from two different labs?
MedlinePlus advises against it, because methods and units vary. Use the same lab when you follow a trend.1
Can I get results straight from the laboratory?
In the US, a laboratory may give completed test reports to a patient on request, after confirming through its own process that the report is yours.3
Can wai tell me what my result means?
A wai Profile gives an understandable answer about your own result, grounded in your record and current evidence, with citations and a clear line when it is time to see your clinician.5 It does not diagnose.
What should I do if a result worries me?
Contact the clinician who ordered the test. If you feel seriously unwell, call your local emergency number.
Sources
- 1MedlinePlus, US National Library of MedicineHow to Understand Your Lab ResultsRead 14 October 2026Read source
- 2Association for Diagnostics and Laboratory Medicine, 2024Time to Reevaluate the 95% Inclusion Criteria for Defining Reference Intervals? (Clinical Chemistry podcast, El-Khoury, Badrick and Theodorsson)Read 14 October 2026Read source
- 3Electronic Code of Federal Regulations42 CFR 493.1291, Standard, test reportRead 14 October 2026Read source
- 4JAMA Network Open, Steitz and colleagues, 2023Perspectives of Patients About Immediate Access to Test Results Through an Online Patient PortalRead 14 October 2026Read source
- 5wai, 2026wai Profiles, a personal health record for every patientRead 14 October 2026Read source
- 6National Cancer InstituteUnderstanding Laboratory TestsRead 14 October 2026Read source
Read every result with confidence, and walk in with the right questions.
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