CD19 Count

Also referred as

CD 19

Flow Cytometry

For men & women

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Contains

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Know more about this test

The CD19 Count test measures the number of CD19+ B cells in blood, including CD19 Absolute Count and %CD19 Cell. 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 supports the diagnosis of certain blood cancers or immune disorders.

Samples required

Blood

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Tata 1mg certified phlebotomists

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. It measures both the percentage of CD19 cells (%CD19 Cells) and the CD19 Absolute Count in the blood, which helps provide a detailed evaluation of B-cell status and immune function. 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?

Contains 2 tests

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. It includes the CD19 Absolute Count, which indicates the actual number of CD19+ B cells present in the blood, and %CD19 Cells, which reflects the percentage of CD19+ B cells among total lymphocytes. 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.

% CD19 Cells

CD19 Absolute Count

Test Information is reviewed by: Dr. Swati Gupta (Anand), MBBS, MD Lab Medicine and written by Shweta Prakash, MSc, BSc . The test details are for information purpose only. Consult a doctor before taking any test. Last updated on: 23rd Aug 2026

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CD19 Count test price for other cities

Price in	Bangalore	Rs. 1979
Price in	New Delhi	Rs. 2159
Price in	Mumbai	Rs. 2579
Price in	Ranchi	Rs. 2039
Price in	Chennai	Rs. 2070

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FAQs related to CD19 Count

What is the CD19 Count test?

The CD19 Count test checks the number and proportion of CD19+ B cells in your blood, including CD19 Absolute Count and %CD19 Cells. These cells are a type of white blood cell that helps your immune system fight infections.

Why is this test done?

Doctors may suggest this test to check for immune system problems or blood cancers like leukemia or lymphoma. It also helps monitor treatment response and immune recovery after therapies like chemotherapy or organ transplants, often with other tests.

What are CD19+ B cells?

CD19+ B cells are white blood cells that produce antibodies. They play an important role in protecting your body from viruses and bacteria.

When might my doctor order this test?

This test is often recommended if you have symptoms such as frequent infections, unexplained weight loss, swollen lymph nodes, fever, or if you are being treated for a blood cancer or immune disorder.

How is the test performed?

A blood sample is drawn from a vein in your arm. The sample is then sent to the lab for flow cytometry analysis, which identifies and counts the CD19+ cells.

Do I need to fast or prepare before the test?

No special preparation or fasting is usually needed. However, inform your doctor about any medications or medical conditions you have.

What do the results mean?

Normal CD19 levels suggest your immune system is functioning well. High CD19 levels may be linked to certain blood cancers or overactive immune activity. Low CD19 levels may suggest immune suppression or bone marrow issues. Always speak with your doctor to understand your test results.

Is the CD19 Count test painful?

No, this test is generally safe with minimal risks. You may feel slight discomfort, bruising, or swelling at the blood draw site, which resolves on its own and is not bothersome.

How often should I get tested?

The frequency of testing depends on your medical condition. If you are being treated for a blood cancer, an immune disorder, or have undergone a transplant, your doctor may recommend regular testing to monitor your immune response. Always follow your doctor’s advice on how often to repeat the test.

Can I do anything to increase or decrease my CD19+ cell levels?

CD19+ cell levels are mainly influenced by your overall health and underlying medical conditions. They cannot be easily changed through lifestyle or diet. If your levels are too high or too low, it is important to consult your doctor, who can recommend appropriate treatment or further evaluation based on the cause.

How does Tata 1mg ensure accurate lab test results?

Tata 1mg ensures accurate lab test results through certified laboratories that use advanced technology and adhere to stringent quality control measures. This commitment to high standards guarantees reliable results.

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