The CD15 test is used to assess the presence of CD15 antigen on the surface of certain white blood cells, primarily granulocytes like neutrophils. CD15 is a cell surface glycoprotein involved in immune responses. It is commonly used in the diagnosis and classification of hematologic disorders, including certain types of leukemia, lymphoma, and other malignancies. The test helps identify specific immune cells and is often part of flow cytometry panels in hematology.

Risk Assessment

• Risks of the test: Minimal risk as it involves a blood sample collection. The main risks are those associated with phlebotomy, including pain, bruising, or infection at the puncture site.
• Risks of high CD15 levels: High CD15 levels can indicate immune system disorders like leukemias or lymphomas. It might also be associated with inflammatory conditions, though further diagnostic workups are needed for a complete assessment.

Normal Range

The normal range for CD15 is generally dependent on the specific methodology and laboratory standards. In healthy individuals, CD15 expression is typically seen on granulocytes (neutrophils, eosinophils) and can range from 50-70%on these cells. The exact range can vary based on the test type and conditions.

Interpretation

• Elevated CD15: Elevated levels might indicate conditions like leukemia (particularly acute myeloid leukemia, chronic myelomonocytic leukemia), Hodgkin lymphoma, or other hematologic malignancies. It could also be elevated in cases of inflammation or immune activation.
• Low or absent CD15: Low levels or lack of CD15 expression may be seen in certain cases of myelodysplastic syndromes, acute lymphoblastic leukemia (ALL), or other lymphoproliferative disorders.

Sample Type

The test typically requires a blood sample, which is collected via venipuncture (blood draw from a vein).