White Blood Cells

Where you'll see it: Full Blood Count (FBC / CBC) reports as WBC.

Clinicians may use this result to:

• Check for infection or inflammation when someone feels unwell.
• Monitor recovery from illness or the effects of certain medications.
• Investigate persistent tiredness, fevers or unexplained symptoms.
• Screen before chemotherapy and other treatments that affect the marrow.

Children have higher ranges. Ranges also vary by laboratory.

A count just above or below the range is common — especially after a recent illness or during pregnancy — and often normalises on repeat testing.

Normal ranges are guides, not verdicts. Interpretation depends on your age, sex, symptoms, medical history, medications and other investigations — which is why your clinician looks at the whole picture rather than a single value.

Not necessarily. A number that sits outside the printed range is a prompt for interpretation — not a diagnosis.

• A single result rarely gives the full picture — clinicians interpret it alongside your symptoms.
• Your medical history, medications and other blood tests all shape the meaning of one value.
• Small movements just outside the reference range are common and often not concerning.
• Repeat testing over time is frequently more useful than any single number.

• A repeat test after any current illness has settled.
• Symptom review by a clinician.
• Further tests such as a blood film or specialist referral if the abnormality persists.

One result rarely tells the whole story. Clinicians look at your symptoms, medical history, medications and other tests together — and a single value that sits slightly outside the reference range is often normal for you. Repeat testing over time is frequently more useful than any one number. Medipher helps you understand what a result means in plain English, but it cannot diagnose medical conditions or replace advice from a doctor, nurse or pharmacist.

Speak with your GP or another healthcare professional if:

• You've been asked to repeat the test.
• You're experiencing new or worsening symptoms.
• Your clinician has flagged the result as needing follow-up.
• You don't understand your results or feel unsure what to do next.

If you have severe symptoms — chest pain, severe breathlessness, fainting, heavy bleeding or feel very unwell — seek urgent help. If this is a medical emergency, call your local emergency number immediately. Medipher is designed to help explain medical information and is not an emergency service.