Leukocytosis

At Montefiore Einstein Hematology (Blood Disorders), you can access exceptional care for leukocytosis. As a global leader in hematology, we are an academic-based, national and international referral site for the most complex and high-risk cases. For over a century, we have been at the forefront of innovation, research and clinical care for all types of blood disorders.

Our team of world-renowned hematologists is passionate about uncovering the latest diagnostic approaches and treatments that can improve outcomes.

At Montefiore Einstein Hematology (Blood Disorders), you can expect compassionate, personalized, research-driven treatment plans that meet the highest standards for quality and safety. By combining innovative therapies with proactive patient outreach, we strive to elevate the standard of care and significantly enhance outcomes for those living with leukocytosis.

When you need leukocytosis care, turn to our dedicated providers who will develop a highly personalized treatment plan.

Leukocytosis can be classified based on the specific type of WBC that is elevated.

• Neutrophilia is the most common type and involves an increased number of neutrophils, typically due to infections, inflammation or stress.
• Lymphocytosis occurs when lymphocyte levels rise, often in response to viral infections or chronic inflammatory conditions as well as blood disorders.
• Monocytosis is characterized by a higher number of monocytes, which may indicate chronic infections or autoimmune disorders.
• Eosinophilia involves increased eosinophils and is often linked to allergies, parasitic infections or autoimmune diseases.
• Basophilia is a rare form of leukocytosis where basophils are elevated, which may indicate chronic inflammatory conditions or blood disorders.

Understanding the type of leukocytosis helps determine the underlying cause and appropriate treatment.

Leukocytosis can result from various factors, including infections, inflammation, stress, immune system disorders and bone marrow diseases. Acute bacterial or viral infections commonly trigger an increase in white blood cell production. Chronic inflammatory diseases such as rheumatoid arthritis or inflammatory bowel disease can also lead to sustained leukocytosis. Physical or emotional stress, including surgery, trauma or vigorous exercise, may cause temporary elevations in WBCs. Smoking can also be associated with leukocytosis. Certain medications, including corticosteroids, may result in increased neutrophil count. In some cases, leukocytosis is linked to hematologic conditions such as leukemia or myeloproliferative disorders, which require prompt diagnosis and specialized treatment.

Symptoms of leukocytosis depend on the underlying cause. Many individuals do not experience noticeable symptoms and only discover elevated WBC levels through routine blood tests. When symptoms do occur, they may include fever, fatigue, night sweats, shortness of breath or unexplained weight loss. If leukocytosis is related to an infection, symptoms may include localized pain, swelling or redness. In cases of blood disorders, individuals may experience fever, night sweats, weight loss, easy bruising, frequent infections or excessive clotting. Because leukocytosis can indicate a range of conditions, a thorough medical evaluation is essential.

Diagnosing leukocytosis begins with a complete blood count (CBC) test to measure white blood cell levels with differential to determine which type of white blood cells is elevated. Review of the peripheral blood smear allows to determine whether cells look normal and mature, which is helpful in evaluating for infections as well as bone marrow disorders. Additional tests may be required to determine the cause, including blood cultures for infections, inflammatory marker tests and bone marrow biopsies to assess WBC production. In cases where an autoimmune or hematologic disorder is suspected, specific antibody or genetic testing may be necessary. Understanding the cause of leukocytosis enables targeted treatment to address the underlying condition.

Treatment for leukocytosis depends on the underlying cause. If it is due to an infection, antibiotics or antiviral medications may be prescribed. For inflammation-related leukocytosis, managing the inflammatory condition with medications such as corticosteroids or immunosuppressants can help regulate WBC levels. If leukocytosis is caused by a hematologic disorder, specialized treatments such as chemotherapy or targeted therapies may be required. In some cases, lifestyle modifications, including stress reduction, adequate hydration and avoiding smoking, may help maintain normal WBC levels. By identifying and addressing the root cause of leukocytosis, healthcare providers can help patients restore balance to their immune system and overall health.