
CD19 Count









The CD19 Count test measures the number of CD19+ B cells in blood. CD19+ B cells are a type of white blood cell that plays an important role in the immune system. This test is commonly used to evaluate immune system health and support the diagnosis of certain blood cancers or immune disorders.













Understanding CD19 Count
CD19+ B cells are a type of white blood cell that plays a crucial role in the immune system. These cells are part of the adaptive immune response and are responsible for producing antibodies that help fight harmful pathogens. CD19+ is a protein marker found on the surface of most B cells, and measuring the levels of these cells gives valuable information about the body’s immune health. It is also an important marker for certain types of blood cancers, including leukemias that arise from B-lymphocytes and Burkitt’s lymphoma, helping doctors support the diagnosis and monitoring of these conditions as part of a panel.
The CD19 Count test uses a highly sensitive technique called flow cytometry to detect and count CD19+ B cells in a blood sample. This test is typically recommended when doctors suspect an immune disorder or a condition affecting B cells, such as leukemia or lymphoma. It may be advised if there are symptoms such as unexplained weight loss, pale skin, unusual bleeding, fever, night sweats, or swelling in the lymph nodes or organs. It also plays an important role in assessing how well a patient's immune system is recovering after bone marrow or organ transplantation, or in response to immunosuppressive therapy. Additionally, it also plays a vital role in monitoring disease recurrence, determining the extent of cancer involvement, and evaluating the effectiveness of treatment.
No special preparation is required for the CD19 Count test. However, provide a brief clinical history at the time of sample collection. Inform the doctor about all the medications, supplements, and underlying illnesses, as all these factors may affect the test results.
Test result ranges are approximate and may differ slightly between labs depending on the methodology and laboratory guidelines. Do not self-medicate and always consult a doctor to understand the test results correctly.
Please note: This is an outsourced test. The sample is collected by TATA 1MG and processed at a NABL accredited partnered lab.
What does CD19 Count measure?
The CD19 Count test measures the number of CD19+ B cells in the blood. These cells play an important role in producing antibodies and fighting infections. Changes in CD19+ count can help identify how well the immune system is functioning and may be seen in conditions like immune suppression or certain blood cancers. This test is useful for evaluating immune-related disorders, monitoring disease progression, and guiding treatment decisions.





FAQs related to CD19 Count
- Wang K, Wei G, Liu D. CD19: a biomarker for B cell development, lymphoma diagnosis and therapy. Exp Hematol Oncol. 2012 Nov 29;1(1):36. [Accessed 04 Aug. 2025] Available from:
- Li W. Flow Cytometry in the Diagnosis of Leukemias. In: Li W, editor. Leukemia [Internet]. Brisbane (AU): Exon Publications; 2022 Oct 16. Chapter 4. [Accessed 04 Aug. 2025] Available from:
- Schanda N, Sauer T, Kunz A, Hückelhoven-Krauss A, Neuber B, Wang L, Hinkelbein M, Sedloev D, He B, Schubert ML, Müller-Tidow C, Schmitt M, Schmitt A. Sensitivity and Specificity of CD19 CAR-T Cell Detection by Flow Cytometry and PCR. Cells. 2021 Nov 17;10(11):3208. [Accessed 04 Aug. 2025] Available from:
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