Monoclonal B-cell lymphocytosis

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[edit | edit source]

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[edit | edit source]

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[edit | edit source]

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[edit | edit source]

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[edit | edit source]

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[edit | edit source]

Monoclonal B-cell lymphocytosis Resources
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