Low Lymphocytes and High Neutrophils: What Your White Cell Results Mean

Lymphocytes and neutrophils are the two most common types of white blood cell. Both are reported in the white cell differential of a full blood count (FBC). Neutrophils are the first responders to bacterial infection and injury, while lymphocytes handle viral infections and long-term immune memory. A low lymphocyte count or a high neutrophil count is a very common result, and the two often appear together.

This guide focuses on those two results: what low lymphocytes and high neutrophils mean, typical ranges, why they often move together, common causes, when to retest and when to get urgent help. For the total white cell count and the other cell types, see our white blood cell count guide.

Test it in Chiswick: our Full Blood Count costs £59 and reports lymphocytes, neutrophils and the other white cells, plus red cells and platelets, with your result explained in person by a practitioner. No GP referral needed. Book this test or call 020 4515 0000.

Want the inflammation picture too? Our Inflammation Check costs £79 and adds CRP, ESR and ferritin to a full blood count, which helps show whether a high neutrophil count fits with active inflammation. Book the Inflammation Check.

Quick answer

As an example, one NHS trust uses adult ranges of about 1.0 to 4.0 x10⁹/L for lymphocytes and 1.8 to 7.5 x10⁹/L for neutrophils, but ranges vary by laboratory, so check your report. A mildly low lymphocyte count is often temporary after a viral infection, stress, hard exercise or steroid medicines. A high neutrophil count most often reflects infection, inflammation, steroids, smoking or recent intense exercise. The two often appear together during a stress response. A single result outside the range is a prompt to recheck, not a diagnosis.

What lymphocytes and neutrophils do

• Neutrophils make up roughly half to three quarters of white cells. They move quickly into tissues to engulf bacteria and are released from the bone marrow in large numbers during infection or stress.
• Lymphocytes include T cells, B cells and natural killer cells. They recognise viruses, make antibodies and remember past infections.

Both are reported as an absolute count in x10⁹/L. Some reports also show a percentage, but the absolute count is the more useful figure.

Typical ranges

Each laboratory sets its own range. As an example, one NHS trust uses these adult ranges:

• Lymphocytes: 1.0 to 4.0 x10⁹/L
• Neutrophils: 1.8 to 7.5 x10⁹/L

NHS GP guidance describes neutrophils above about 8.5 x10⁹/L as raised. People of Black African, African Caribbean and some Middle Eastern backgrounds can naturally have lower neutrophil counts that are healthy for them, so ranges are interpreted with this in mind.

Why low lymphocytes and high neutrophils often go together

When the body is under stress, for example during an infection, after surgery, after very hard exercise or with steroid medicines, stress hormones such as cortisol push neutrophils out of the bone marrow and move lymphocytes out of the bloodstream into tissues. The result is a higher neutrophil count and a lower lymphocyte count on the same test. Some clinicians look at the neutrophil to lymphocyte ratio as a general marker of this stress response, but it is not a diagnostic test on its own. This pattern usually settles once the trigger has passed.

Common causes of low lymphocytes

• Recent viral infections, including colds, flu and COVID-19, which can lower lymphocytes for a few weeks
• Steroid medicines and other medicines that dampen the immune system
• Physical or emotional stress, poor sleep and very intense exercise
• Heavy alcohol use and poor nutrition
• Autoimmune conditions such as lupus
• Less commonly, HIV, cancer treatment or conditions affecting the bone marrow or lymph glands

Common causes of high neutrophils

• Bacterial infections, such as chest, urine or skin infections
• Inflammation from injury, surgery or conditions such as inflammatory arthritis or bowel disease. A CRP test helps show this.
• Steroid medicines, which commonly raise neutrophils
• Smoking, which can keep neutrophils mildly raised long term
• Hard exercise, stress or pregnancy
• Less commonly, bone marrow conditions, particularly if the count stays high without a clear cause

What usually happens next

1. Consider recent events. Illness, medicines, stress, smoking and exercise explain most mild changes.
2. Look at the rest of the blood count. Results are more reassuring when red cells, platelets and the other white cells are normal.
3. Repeat the test once you have recovered, often after 4 to 6 weeks.
4. Further tests such as CRP, a blood film or a GP review if the change persists, is marked or comes with symptoms.

When to get urgent help

• Call 999 or go to A&E if you have signs of sepsis, such as slurred speech or confusion, blue, grey or blotchy skin, difficulty breathing, or a rash that does not fade when a glass is rolled over it.
• Contact your cancer care team or chemotherapy helpline immediately if you have a temperature during cancer treatment.
• Contact NHS 111 or your GP if you feel unwell with a high temperature and are not sure what to do.

See your GP soon if you have night sweats, unexplained weight loss, swollen glands that do not go down, frequent infections or unusual bruising.

Preparing for your test

No fasting is needed for a full blood count. If you can, test when you have been free of infections for a couple of weeks and avoid very hard exercise the day before. Tell us about steroid and other prescribed medicines.

How often to retest

A mildly low lymphocyte or high neutrophil count is usually repeated after 4 to 6 weeks, once any illness has passed. Persistent or marked changes are reviewed by your GP, who may arrange further tests.

Frequently asked questions

Is a lymphocyte count of 0.9 a worry?

It is slightly below many ranges. After a recent virus, stress or steroids this is common and usually temporary. A repeat test after recovery is sensible.

Can stress cause high neutrophils?

Yes. Physical or emotional stress releases cortisol, which raises neutrophils and lowers lymphocytes for a time.

Do high neutrophils mean I have an infection?

Not always. Steroids, smoking, exercise and inflammation can raise them too. Your symptoms and CRP help put the result in context.

Does a low lymphocyte count mean a weak immune system?

A short-lived dip is common and does not usually mean that. A count that stays low is worth discussing with your GP.

Full blood count testing in Chiswick

We take your blood sample at our clinic at 8 to 9 Bedford Corner, The Avenue, Chiswick, London W4 1LZ, a short walk from Turnham Green station on the District line (Piccadilly line trains stop there early morning and late evening only), and on the 94, E3 and 272 bus routes. Limited parking is available on request when you book. Your sample is analysed by the Randox laboratory, and a practitioner talks you through what your result means. No GP referral is needed, and we can send a GP feedback report on request.

Book a Full Blood Count or our Inflammation Check. You can also compare every blood test and price, read our white blood cell count guide, or learn about platelet counts and haemoglobin levels.

This article is general information, not medical advice. Discuss your results with your GP or practitioner.