Biomarker guide · Immune health

White blood cell count test in the UK

A white blood cell count (WBC) measures the immune cells in your blood and is part of a full blood count. In the UK you can test it privately in TrueVitals Advanced (£319, 74 biomarkers) or Ultimate (£399, 140 biomarkers), both including the clinic draw and the full differential: neutrophils, lymphocytes, monocytes, eosinophils and basophils. Ultimate adds ratios such as the neutrophil-to-lymphocyte ratio.

In: Advanced, Ultimate & SignatureFrom: £319 incl. drawSample: Venous bloodResults: 4 working days

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What the white cell count shows

White blood cells fight infection and drive inflammation and repair. The total count tells you how many there are; the differential breaks that total into five types, which is where most of the useful information is. A total in range can still hide one type that is high or low.

The five types

Neutrophils: front-line defence against bacteria. Rise with bacterial infection, stress, smoking and steroids.
Lymphocytes: fight viruses and make antibodies. Often rise during or after viral illness.
Monocytes: clean up and repair; raised in longer-running infection or inflammation.
Eosinophils: linked to allergy, asthma, eczema and parasites.
Basophils: a small allergy-related cell, rarely significant alone.

What high and low results can mean

High white count

A current or recent infection
Inflammation, injury or recent hard exercise
Smoking
Steroid medicines
Rarely, a blood disorder

Low white count

A recent viral illness
Some medicines, including some antibiotics and immune treatments
Low B12 or folate
Autoimmune conditions
A naturally lower neutrophil count, which is normal for some people of African or Middle Eastern heritage

If you have been ill recently, a repeat test a few weeks later is often the most useful next step.

Typical ranges

For adults, the total white cell count is usually around 4.0 to 11.0 × 10⁹/L. Each of the five types has its own range. Your report uses the lab's ranges for your sample and shows where you sit within each one.

Where to get a white blood cell count test in the UK

Option	Includes it	Price	What else you get
TrueVitals Advanced	Yes	£319 incl. clinic draw (home visit £29 extra)	Full blood count with all five white cell types. Clinician-reviewed report in 4 working days.
TrueVitals Ultimate	Yes	£399 incl. clinic draw (home visit £29 extra)	Adds calculated ratios (neutrophil-to-lymphocyte, platelet-to-lymphocyte) for a fuller inflammation picture.
TrueVitals Signature	Yes	£799 incl. draw	230 biomarkers at Randox Health clinics, up to 12 working days.
NHS GP	On request	Free if clinically indicated	A full blood count is one of the most common GP tests.

TrueVitals prices checked 5 November 2026. Every TrueVitals report is clinician-reviewed. Pay in instalments with Klarna or Clearpay. Book a draw at one of 103 partner clinics, or add a home visit.

Be honest with yourself about what this test is for

When you need care today, not a test: a fever with shivering, feeling very unwell, a new rash that does not fade when pressed, or any infection while you know your white count is low needs urgent advice from 111 or A&E.

A private panel is a good way to get a baseline, understand a result in context and track it over time. It does not replace your GP for symptoms, and anything that needs follow-up is flagged in plain words in your report.

Read alongside

White blood cell count on its own rarely tells the whole story. In TrueVitals panels it is reported with these related markers:

NeutrophilsLymphocyteshs-CRPNeutrophil-to-lymphocyte ratioVitamin B12 Ferritin

Frequently asked questions

What is a normal white blood cell count?

For adults it is usually around 4.0 to 11.0 × 10⁹/L, though labs differ slightly. Your report uses the lab's own range.

Should I worry about a slightly low white blood cell count?

A mildly low count is common, especially after a viral illness, and in some people it is simply their normal. Your report looks at which cell type is low and at related results such as B12 and folate. Persistently low counts are worth discussing with your GP.

Can stress or exercise change my white cell count?

Yes. Physical stress, hard training and poor sleep can temporarily raise neutrophils. Try to test after a rest day and when you have not been ill for a couple of weeks.

Is a white blood cell count the same as a full blood count?

It is one part of it. A full blood count also covers red cells, haemoglobin and platelets. TrueVitals panels include the full blood count with the five-part white cell differential.

Which panel should I choose for immune health?

Advanced covers the full blood count and hs-CRP. Ultimate adds the inflammation ratios and 66 more biomarkers, which helps if you are getting recurrent infections or feeling run down.

How quickly do results come back?

Advanced and Ultimate reports are back within 4 working days of the sample reaching the lab, with a clinician-reviewed explanation.

How this page was written: by James Smillie, founder of TrueVitals, reviewed by the TrueVitals clinical review team, using NHS and laboratory reference sources. Ranges are typical values; your report uses your lab's own ranges. TrueVitals sells the panels named on this page, so we have stated plainly what this test cannot do. Last updated 5 November 2026.

Test it properly, with the context around it

Ultimate: 140 biomarkers (139 for women), £399 including the clinic draw, home visit £29 extra. Clinician-reviewed report within 4 working days.

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