FLOW CYTOMETRY, CD 45

The Flow Cytometry CD45 Test is a specialized immunophenotyping assay used to detect and evaluate CD45, also known as the Leukocyte Common Antigen (LCA). CD45 is expressed on nearly all nucleated white blood cells and serves as one of the most important markers in flow cytometry for identifying and classifying leukocyte populations.

Flow cytometry technology allows rapid analysis of thousands of cells individually, providing detailed information about cell size, complexity, and marker expression. CD45 is routinely used as a backbone marker in comprehensive flow cytometry panels because it helps distinguish different white blood cell populations, including lymphocytes, monocytes, granulocytes, and abnormal blast cells.

The test plays a critical role in diagnosing and classifying leukemia, lymphoma, myelodysplastic syndromes, and other hematological malignancies. CD45 expression patterns are especially useful in identifying abnormal cell populations and differentiating leukemic blasts from normal blood and bone marrow cells.

Benefits of the Test

• Identifies and classifies white blood cell populations
• Assists in leukemia and lymphoma diagnosis
• Helps detect abnormal blast cells
• Supports hematological malignancy classification
• Aids bone marrow disorder evaluation
• Provides essential information for immunophenotyping

Why Doctors Recommend This Test

Doctors may recommend Flow Cytometry CD45 testing for:

• Suspected leukemia
• Suspected lymphoma
• Bone marrow disorder evaluation
• Abnormal blood counts
• Myelodysplastic syndrome investigation
• Acute leukemia classification
• Monitoring hematological malignancies
• Comprehensive flow cytometry immunophenotyping

The test helps characterize normal and abnormal leukocyte populations and contributes to accurate diagnosis.

Preparation Before Test

The test may require:

• Peripheral blood sample
• Bone marrow aspirate
• Body fluid specimen
• Lymph node specimen
• Other clinically relevant samples

Preparation generally includes:

• No fasting is required
• Inform your physician about ongoing treatments
• Follow laboratory collection instructions

The specimen is analyzed using advanced multiparameter flow cytometry systems.

Normal Reporting Time

Results are generally available within 1 to 3 working days, depending on laboratory workflow and panel complexity.

Who Should Take This Test?

• Patients with suspected leukemia
• Individuals with suspected lymphoma
• Patients with abnormal blood counts
• Individuals undergoing bone marrow evaluation
• Patients with hematological malignancies
• Individuals referred by hematologists or oncologists

Flow Cytometry CD45 testing is a fundamental component of modern hematology diagnostics and leukemia immunophenotyping.

Clinical Significance

CD45 expression is commonly evaluated in:

• Acute Myeloid Leukemia (AML)
• Acute Lymphoblastic Leukemia (ALL)
• Chronic Leukemias
• Non-Hodgkin Lymphoma
• Hodgkin Lymphoma (supportive evaluation)
• Myelodysplastic Syndromes (MDS)
• Bone Marrow Disorders
• Lymphoproliferative Disorders

Different levels and patterns of CD45 expression help distinguish blast cells from mature leukocytes and assist in determining cell lineage.

Important Note

CD45 is rarely interpreted alone. It is used together with lineage-specific markers such as CD3, CD4, CD8, CD19, CD20, CD34, CD33, CD13, CD117, HLA-DR, and others. Comprehensive interpretation by a hematopathologist is essential for accurate diagnosis and disease classification.