Seeing a high, low or borderline flag can be unsettling, especially when results appear in an NHS App or portal before anyone has discussed them with you. A flag is a prompt for review, not automatically a diagnosis, treatment decision or emergency.
This guide helps you organise the report and prepare a clinician conversation. It does not assign urgency from a number alone, replace the ordering service or tell you to repeat tests, change medicines or wait for care.
A five-part check before your appointment
| 1. Value | What number is shown? | Copy it accurately; avoid relying on a cropped screenshot |
|---|---|---|
| 2. Unit | How is it measured? | The same test can use different units |
| 3. Interval | What range is printed by this laboratory? | Do not replace it with a generic online range |
| 4. Date and trend | When was it measured and what came before? | A trend may be more useful than one result |
| 5. Context | Why was it ordered and how do you feel? | Symptoms, medicines, pregnancy and recent illness can matter |
If the report says critical, panic or urgent, follow the report's instruction and contact the responsible clinical team rather than waiting for an educational explanation.
Who owns the next step?
The GP surgery, hospital team or other service that ordered the test is responsible for explaining the result and deciding follow-up. Results may appear in different systems at different times, and not every result is displayed in the same way in the NHS App.
If you are unsure who ordered the test, contact the service that arranged the blood draw or the practice shown in the result message. Keep the full report, not just the flagged line.
Questions that make an appointment more useful
Ask: Which result is outside this laboratory's range? How does it compare with my previous results? Could recent illness, medicines, supplements, pregnancy or another part of the report affect it? Do I need follow-up, and who will arrange it? What symptoms should prompt me to seek help sooner?
Write down when symptoms started, what changes them, relevant medicines and supplements, and any major recent illness. The aim is a clear conversation, not a self-diagnosis from a reference table.
When an article is not the right next step
If you have severe, new or worsening symptoms, use the responsible clinical team or the appropriate NHS urgent-care channel. If the report contains critical or urgent wording, follow its instructions. Do not wait for Lafia to decide whether you need care.
When to contact your healthcare team
- Follow any critical, panic or urgent wording on the report immediately and contact the responsible clinical team.
- Seek appropriate urgent care for severe or worsening symptoms such as chest pain, severe breathlessness, fainting, new confusion or uncontrolled bleeding.
- For a non-urgent flag, arrange follow-up with the service that ordered the test and bring the full report, units and previous results.
- Do not start or stop medication, supplements or treatment because an article or automated explanation suggests it.
Common questions
Does an abnormal flag mean I have a disease?
No. A flag means the result is outside that laboratory's reference interval or has triggered a report comment. The meaning depends on the result, trend, symptoms and clinical context.
What should I take to my GP appointment?
Take the full report with values, units, dates and printed intervals. Note relevant symptoms, when they began, previous results, medicines, supplements, pregnancy if relevant and the questions you want answered.
Should I repeat an abnormal blood test myself?
Do not arrange repeat testing or change treatment from an article alone. Ask the ordering clinician what follow-up is appropriate and who will arrange it.
Related guides
- How to understand your lab results (without a medical degree)
- Full blood count (FBC) results explained in the UK
- HbA1c results explained: mmol/mol, high-risk and diabetes ranges (UK)
- eGFR and creatinine: how to read kidney function blood tests (UK)
- Liver blood tests explained: ALT, AST, GGT and bilirubin (UK)
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Lafia organises the values, units and reference intervals shown on your report. It is automated education and appointment preparation—not clinician review, diagnosis, treatment advice or emergency care.
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Medical disclaimer: This article is for educational and informational purposes only and does not constitute medical advice, diagnosis or treatment. Reference intervals vary between laboratories—use the value, unit, date and range printed on your own report, and consult a qualified healthcare professional about your results and symptoms.