Leukopenia/Neutropenia
What is Leukopenia/Neutropenia?
Leukopenia is a condition where your white blood cell count drops below 4,000 cells per microliter of blood. White blood cells are your immune system's first line of defense against infections. When these cells drop too low, your body becomes more vulnerable to bacteria, viruses, and other germs.
Neutropenia is a specific type of leukopenia where neutrophils, the most common white blood cells, fall below normal levels. Neutrophils attack bacteria and fungi that enter your body. When neutrophil counts drop below 1,500 per microliter, you face a higher risk of infections. Severe neutropenia, with counts below 500 per microliter, creates serious infection risk.
Both conditions can be temporary or chronic. They may result from medications, infections, autoimmune diseases, or bone marrow problems. Many people discover they have leukopenia during routine blood work because symptoms often appear only when an infection develops.
Symptoms
- Frequent infections such as colds, flu, or pneumonia
- Fever that appears suddenly or repeatedly
- Mouth sores or ulcers that heal slowly
- Sore throat or painful swallowing
- Skin infections, abscesses, or slow wound healing
- Unusual fatigue or weakness
- Swollen lymph nodes
- Chills or sweating
Many people with mild leukopenia have no symptoms at all. Symptoms typically appear only when white blood cell counts drop significantly or when an infection develops. Some individuals discover their condition during routine blood testing before any signs emerge.
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Causes and risk factors
Leukopenia develops when your bone marrow produces too few white blood cells, when these cells are destroyed too quickly, or when they become trapped in your spleen. Chemotherapy and radiation therapy commonly cause temporary leukopenia by damaging bone marrow cells. Certain medications including antibiotics, antipsychotics, and immunosuppressants can lower white blood cell production. Autoimmune diseases like lupus and rheumatoid arthritis may cause your immune system to attack its own white blood cells.
Viral infections such as HIV, hepatitis, and Epstein-Barr virus can temporarily reduce white blood cell counts. Bone marrow disorders including aplastic anemia, myelodysplastic syndromes, and leukemia affect cell production directly. Nutritional deficiencies in vitamin B12, folate, and copper may contribute to low counts. Some people inherit genetic conditions that cause chronic neutropenia from birth. Severe infections can overwhelm and deplete white blood cells faster than your body replaces them.
How it's diagnosed
Leukopenia is diagnosed through a complete blood count, or CBC, which measures the number of white blood cells in your blood. A normal white blood cell count ranges from 4,000 to 11,000 cells per microliter. Counts below 4,000 indicate leukopenia. Your doctor will also look at your differential count, which breaks down the types of white blood cells to identify if neutrophils specifically are low.
Rite Aid's blood testing service includes White Blood Cell Count as part of the flagship panel. You can get tested twice a year at over 2,000 Quest Diagnostics locations nationwide. If your initial test shows low white blood cell counts, your doctor may order additional tests to find the underlying cause. These may include bone marrow biopsy, vitamin level testing, or autoimmune screening depending on your symptoms and medical history.
Treatment options
- Stop or adjust medications that may be causing low white blood cell counts
- Treat underlying infections with antibiotics or antiviral medications
- Use growth factors like filgrastim or pegfilgrastim to stimulate white blood cell production
- Address nutritional deficiencies with vitamin B12, folate, or copper supplementation
- Eat a nutrient-dense diet rich in lean proteins, leafy greens, and whole grains
- Practice good hygiene to reduce infection risk, including frequent handwashing
- Avoid crowds and people who are sick when counts are very low
- Get adequate sleep and manage stress to support immune function
- Treat autoimmune conditions with immunosuppressive therapy when appropriate
- Consider bone marrow transplant for severe cases related to marrow failure
Concerned about Leukopenia/Neutropenia? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
A white blood cell count below 1,000 cells per microliter is considered dangerously low. Severe neutropenia, with neutrophil counts below 500 per microliter, creates high infection risk. At these levels, even minor infections can become life-threatening and require immediate medical attention.
Leukopenia can resolve on its own if caused by temporary factors like viral infections or certain medications. Once the infection clears or the medication is stopped, white blood cell counts often return to normal within weeks. Chronic leukopenia caused by bone marrow disorders or autoimmune diseases typically requires ongoing treatment.
Testing frequency depends on the severity and cause of your leukopenia. People with mild, stable leukopenia may need testing every 3 to 6 months. Those on chemotherapy or medications that affect white blood cells often need weekly or monthly monitoring. Your doctor will create a testing schedule based on your specific situation.
Foods rich in vitamins and minerals support white blood cell production. Lean proteins like chicken, fish, and eggs provide amino acids needed for cell production. Leafy greens, citrus fruits, and berries offer vitamin C and folate. Nuts, seeds, and whole grains provide zinc and selenium that support immune function.
Leukopenia causes a weakened immune system because you have fewer white blood cells to fight infections. However, not all weakened immune systems involve low white blood cell counts. Some people have normal counts but their white blood cells do not function properly. Leukopenia specifically refers to the quantity of white blood cells, not their quality.
Chronic stress can affect white blood cell counts, but it rarely causes leukopenia by itself. Stress hormones like cortisol can alter white blood cell distribution in your body. However, medications taken for stress-related conditions or autoimmune diseases triggered by stress may contribute to low counts. Managing stress supports overall immune health.
Chemotherapy drugs are the most common medications that cause leukopenia. Antibiotics like penicillin and sulfonamides can lower counts in some people. Antipsychotic medications, especially clozapine, carry leukopenia risk. Immunosuppressants used for autoimmune diseases and anti-seizure medications may also reduce white blood cell production.
Wash your hands frequently with soap and water, especially before eating and after using the bathroom. Avoid contact with people who have colds, flu, or other infections. Cook meat and eggs thoroughly and wash fruits and vegetables carefully. Stay up to date on vaccinations and see your doctor at the first sign of fever or infection.
Leukopenia can be a sign of blood cancers like leukemia or lymphoma, but most cases have other causes. Cancer in the bone marrow can prevent normal white blood cell production. However, medications, infections, and autoimmune diseases cause leukopenia much more commonly than cancer. Your doctor will use additional tests to determine the underlying cause.
Not necessarily. Many cases of leukopenia are temporary and resolve once the underlying cause is treated. People who develop leukopenia from viral infections or medications often see their counts return to normal. Chronic conditions like autoimmune diseases or bone marrow disorders may cause persistent leukopenia that requires ongoing management.