Monoclonal B-cell lymphocytosis

Monoclonal B-cell lymphocytosis
Synonyms	MBL
Pronounce	N/A
Specialty	N/A
Symptoms	Usually asymptomatic
Complications	May progress to chronic lymphocytic leukemia
Onset	Typically in older adults
Duration	Indefinite
Types	N/A
Causes	Unknown
Risks	Age, family history of hematologic malignancies
Diagnosis	Flow cytometry
Differential diagnosis	Chronic lymphocytic leukemia, Non-Hodgkin lymphoma
Prevention	N/A
Treatment	Observation
Medication	N/A
Prognosis	Generally good, but requires monitoring
Frequency	Common in older adults
Deaths	N/A

Monoclonal B-cell lymphocytosis (MBL) is a condition characterized by the presence of abnormal B cells in the blood. It is not a disease, but rather a laboratory finding that is often discovered incidentally during routine blood tests. MBL is considered a precursor state to certain types of lymphoma, particularly chronic lymphocytic leukemia (CLL).

Definition

Monoclonal B-cell lymphocytosis is defined by the presence of fewer than 5,000 monoclonal B-cells per microliter of blood, with no other signs or symptoms of lymphoproliferative disorders. The B-cells are monoclonal, meaning they are all identical clones of a single original cell.

Types

There are two types of MBL: 'low-count' and 'high-count'. Low-count MBL is more common and is usually not associated with progression to CLL. High-count MBL, on the other hand, has a higher risk of progression to CLL, although this risk is still relatively low.

Risk Factors

The risk factors for developing MBL include age, with the condition being more common in older adults, and a family history of CLL or other lymphoproliferative disorders.

Diagnosis

MBL is usually discovered incidentally during routine blood tests. If MBL is suspected, a flow cytometry test can be used to confirm the diagnosis. This test can identify the abnormal B-cells and determine whether they are monoclonal.

Treatment

As MBL is not a disease, it does not require treatment. However, individuals with high-count MBL may be monitored closely for signs of progression to CLL.

See Also

• Chronic lymphocytic leukemia
• Lymphoma
• B cells
• Flow cytometry