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Basophilia – Causes, Symptoms and Treatment

Basophilia refers to an elevated number of basophils in the blood. It may indicate allergic reactions, inflammatory conditions, or blood disorders.

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Things worth knowing about "Basophilia"

Basophilia refers to an elevated number of basophils in the blood. It may indicate allergic reactions, inflammatory conditions, or blood disorders.

What is Basophilia?

Basophilia is a condition in which the number of basophils in the blood is abnormally elevated. Basophils are a subtype of white blood cells (leukocytes) that play a key role in the immune system, particularly in allergic reactions and inflammatory processes. Under normal circumstances, basophils account for less than 1% of all leukocytes. When this proportion is persistently exceeded, the condition is referred to as basophilia.

Causes

An elevated basophil count can result from a variety of underlying conditions:

Allergic diseases: Allergies, allergic asthma, or allergic rhinitis can cause a temporary rise in basophil levels.
Chronic inflammation: Inflammatory bowel diseases such as Crohn's disease or ulcerative colitis may be associated with increased basophil counts.
Hematological disorders: Blood system diseases such as chronic myeloid leukemia (CML) or other myeloproliferative neoplasms are among the most common causes of significant basophilia.
Hypothyroidism: An underactive thyroid gland can also be associated with elevated basophil values.
Infections: Certain viral or parasitic infections may temporarily elevate basophil counts.
Iron deficiency anemia: In rare cases, iron deficiency can influence basophil levels.

Symptoms

Basophilia itself does not typically cause specific symptoms. Any complaints that arise are usually related to the underlying condition:

Itching (pruritus) and skin redness in allergic conditions
Fatigue and general malaise
Abdominal pain or diarrhea in inflammatory bowel disease
Night sweats, unintentional weight loss, and an enlarged spleen in hematological disorders

Diagnosis

Basophilia is typically identified through a complete blood count with differential (CBC differential), which determines the percentage and absolute count of each type of leukocyte. An absolute basophil count exceeding 100 basophils per microliter of blood (or more than 1% of total leukocytes) is considered basophilia.

Further investigations to determine the underlying cause may include:

Thyroid function tests (TSH, fT3, fT4)
Inflammatory markers (CRP, ESR)
Allergy testing (IgE levels, skin prick test)
Bone marrow biopsy if a hematological disorder is suspected
Molecular genetic testing for the BCR-ABL1 fusion gene (if CML is suspected)

Treatment

There is no specific treatment for basophilia itself. Therapy is always directed at the underlying cause:

Allergies: Antihistamines, allergen avoidance, and possibly immunotherapy (desensitization)
Chronic myeloid leukemia: Treatment with tyrosine kinase inhibitors (e.g., imatinib)
Hypothyroidism: Hormone replacement therapy with levothyroxine
Inflammatory bowel disease: Anti-inflammatory medications, immunosuppressants

Early medical evaluation is important, as persistent basophilia can indicate serious underlying conditions that require prompt diagnosis and treatment.

References

Bain, B.J. - Blood Cells: A Practical Guide, 5th edition, Wiley-Blackwell, 2015.
Swerdlow, S.H. et al. - WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues, 4th edition, IARC Press, 2017.
Kaushansky, K. et al. - Williams Hematology, 9th edition, McGraw-Hill Education, 2016.

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