High Neutrophils and Low Lymphocytes: What Does This Pattern Mean?

High neutrophils and low lymphocytes means one type of white blood cell is above the laboratory range while another is below it. This pattern is often seen when the body is responding to stress, such as an infection, an injury, surgery or a course of steroid medicine. On its own it does not tell anyone what the cause is.

Neutrophils are the most common white blood cells and a main defence against infection. Lymphocytes include B cells and T cells, which help fight viruses and other germs. A complete blood count with differential reports both, as an absolute count and as a percentage of all white cells.

This guide covers the combination. For a raised total white cell count, or a raised lymphocyte count, see the separate SameCase guides on those results.

A blood result never outranks how someone is feeling. Because this pattern often appears with infection, it is worth knowing the signs of sepsis. The NHS advises calling emergency services or going to an emergency department straight away for any of the following:

• Breathing very fast.
• Confusion, slurred speech or not making sense.
• Blue, pale, grey or blotchy skin, lips or tongue. On darker skin, check the palms or soles.
• A rash that does not fade when you press it.
• Any symptoms you are worried could be sepsis.

Cleveland Clinic notes that a high neutrophil count usually causes no symptoms itself; symptoms come from whatever is causing it. Contact a clinician promptly, rather than waiting for a routine repeat test, if you have a temperature of 38°C (100.4°F) or higher, marked tiredness or weakness, feeling faint, infections that keep coming back, sores that do not heal or swollen, painful joints.

Also ask for earlier review if symptoms are getting worse, if new symptoms appear, or if your report flags other results, such as low red cells or abnormal platelets.

Stress hormones push the two counts in opposite directions. A 2022 review in the International Journal of Molecular Sciences explains that high cortisol levels raise neutrophil counts while lowering lymphocyte counts, and that adrenaline has a similar effect. That is why the same pattern can follow very different events.

NHS Highland's clinical guidance lists bacterial infection, smoking, corticosteroids and stress events such as trauma, seizures or a heart attack among the causes of raised neutrophils. Cleveland Clinic adds inflammation, physical or emotional stress, vigorous exercise and reactions to medicines.

On the lymphocyte side, the US National Heart, Lung, and Blood Institute (NHLBI) lists causes of a low count that include infections such as influenza, COVID-19, pneumonia, sepsis and HIV, steroid therapy, major surgery, cancer treatment, autoimmune conditions, heavy alcohol use and poor nutrition.

• Infection: often bacterial for raised neutrophils, while several viral and other infections can lower lymphocytes.
• Steroid medicines (corticosteroids): can raise neutrophils and lower lymphocytes at the same time.
• Physical stress: surgery, injury, a seizure or a serious illness.
• Other factors: smoking, vigorous exercise and inflammation from conditions such as rheumatoid arthritis or inflammatory bowel disease.

The NLR is the absolute neutrophil count divided by the absolute lymphocyte count. Some reports and online tools calculate it automatically. It is not a separate blood test; it is arithmetic on numbers you already have.

Researchers have linked a higher NLR with outcomes in infection, heart disease and cancer. However, the 2022 review states that a precise, unique cut-off value has not been found, and that age, sex, steroid use, emotional stress and many illnesses all affect it. A ratio from one sample cannot say which of these is at work.

If you see an NLR on a report or app, ask your clinician whether it changes anything for you. In most everyday care, the individual counts, your symptoms and the trend matter more than the ratio.

Many different situations produce the same two numbers. A person with a chest infection, someone recovering from an operation and someone taking steroid tablets for asthma may all show high neutrophils and low lymphocytes. MedlinePlus notes that results outside the range do not always mean a condition needs treatment, and that they are read with symptoms, history and other tests.

Cleveland Clinic explains that a raised neutrophil count is not treated directly; the cause is. Once an infection clears or a steroid course ends, the counts often move back towards the usual range. A clinician may simply repeat the test later to see whether that happens.

Less commonly, blood disorders can affect these counts. NHS Highland suggests specialist review when neutrophils stay very high without a reactive cause, or when the spleen is enlarged or the blood film looks abnormal. Persistent unexplained results are followed up for that reason.

It helps to bring copies of earlier blood counts, the dates of any recent infection, operation or injury, and a list of every medicine, including steroid tablets, inhalers and creams. Ask how and when any repeat result will reach you, and who to contact if it does not.

These questions can help you leave the appointment clear about what the result means for you and what happens next:

• Are my absolute neutrophil and lymphocyte counts outside the range, or only the percentages?
• Could my recent illness, surgery, stress or any of my medicines, including steroids or inhalers, explain this pattern?
• Are my total white cell count, red cells and platelets normal?
• Does the neutrophil-to-lymphocyte ratio change anything in my case?
• Should the test be repeated, and when? What result would change the plan?
• Which symptoms should make me seek care before the next test?

On SameCase, patients and verified doctors share de-identified cases. Reading how others with this pattern described recent infections, steroid courses, repeat counts and follow-up may help you notice details worth mentioning and questions worth asking.

Another person's case cannot explain your result or replace an assessment. Bring a short written list of what you noticed, with the dates of any illness or medicine changes, to the clinician who knows your history.