B cells, also known as B lymphocytes, are a crucial component of the adaptive immune system. They function primarily by producing antibodies against antigens, which are substances recognized as foreign by the immune system. These antibodies are specific proteins that can directly neutralize invaders or tag them for destruction by other parts of the immune system. The "% B Cell" marker is thus an important indicator of the body's ability to mount an effective humoral immune response.

The biomarker "% CD 3 Pos. Lymph." in a T + B-Lymphocyte Differential panel from Labcorp refers to the percentage of lymphocytes in the blood that are CD3 positive. CD3 is a protein complex and a T-cell co-receptor that defines T-lymphocytes, which are crucial components of the immune system.

This marker is used to evaluate the immune system's health, particularly in diagnosing and monitoring conditions affecting T-cell function, such as immunodeficiency disorders or certain types of leukemia. The measurement of CD3 positive lymphocytes helps in understanding the proportion of T cells in the overall lymphocyte population, providing insight into the body's adaptive immune response.

The proportion of all immune cells that are T cells. This figure is rarely used for making treatment decisions.

The CD4 percentage (CD4%) is the percentage of white blood cells (lymphocytes) that are CD4 cells.

The immune system contains lots of different cells. The two main types of lymphocytes are T cells and B cells. CD4 cells are a type of T cell. So the CD4% looks at the CD4 count in relation to other immune cells.

CD4% is sometimes a more stable indication of whether there has been a change in the immune system. If the percentage hasn’t changed the change in the absolute count is not important.

The CD4 percentage (CD4%) is the percentage of white blood cells (lymphocytes) that are CD4 cells.

The immune system contains lots of different cells. The two main types of lymphocytes are T cells and B cells. CD4 cells are a type of T cell. So the CD4% looks at the CD4 count in relation to other immune cells.

CD4% is sometimes a more stable indication of whether there has been a change in the immune system. If the percentage hasn’t changed the change in the absolute count is not important.

The proportion of all T cells that are CD8 cells.

CD8 cells are also called cytotoxic T-lymphocytes. They help fight cancer and germs that live inside your cells (intracellular pathogens).

The CD8 percentage is sometimes more reliable than the absolute count of CD8 because it tends to vary less.

The proportion of all T cells that are CD8 cells.

CD8 cells are also called cytotoxic T-lymphocytes. They help fight cancer and germs that live inside your cells (intracellular pathogens).

The CD8 percentage is sometimes more reliable than the absolute count of CD8 because it tends to vary less.

The CD19 antigen (aka B-lymphocyte antigen CD19 or Cluster of Differentiation 19) plays an important role in clinical oncology. It’s a protein found on the surface of B-cells, a type of white blood cell.

The biomarker "% CD19+ Lymphs" in a T + B-Lymphocyte Differential panel from Labcorp quantifies the percentage of lymphocytes in the blood that are B cells, identified by the presence of the CD19 protein on their surface. CD19 is a critical component of the B cell receptor complex and plays a vital role in the development and function of B cells. B cells are essential for the adaptive immune response, primarily responsible for antibody production.

The percentage of CD3+ T cells, often referred to as mature T cells, is a crucial component of the immune system and plays a central role in defending the body against infections and other foreign invaders. These cells are characterized by the presence of the CD3 surface marker, which is involved in T cell receptor signaling. CD3+ T cells can be further divided into two main subsets: CD4+ T cells (helper T cells) and CD8+ T cells (cytotoxic T cells). CD4+ T cells assist in orchestrating immune responses by coordinating various immune cells and directing them to combat specific pathogens. On the other hand, CD8+ T cells are responsible for directly identifying and destroying infected or abnormal cells, such as virus-infected cells and cancer cells. An optimal balance and functionality of these T cell subsets are critical for a healthy immune response.

This test is used to detect soluble IL-2Rα in human plasma or serum produced in response to increased activation of B and T cells and immune system activation. Studies show elevated levels of sIL-2Rα in serum with the onset of rejection episodes in allograft recipients, autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus (SLE), hemophagocytic lymphohistiocytosis (HLH) and in the course of some leukemias and lymphomas. This test may be of diagnostic and/or prognostic value in HLH, granulomatous, autoimmune, and malignant diseases.

This test is used to detect soluble IL-2Rα in human plasma or serum produced in response to increased activation of B and T cells and immune system activation. Studies show elevated levels of sIL-2Rα in serum with the onset of rejection episodes in allograft recipients, autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus (SLE), hemophagocytic lymphohistiocytosis (HLH) and in the course of some leukemias and lymphomas. This test may be of diagnostic and/or prognostic value in HLH, granulomatous, autoimmune, and malignant diseases.

The CD4 percentage (CD4%) is the percentage of white blood cells (lymphocytes) that are CD4 cells.

The % CD57+ CD16+ NK marker represents the proportion of Natural Killer (NK) cells in the blood that express the CD57 and CD16 surface proteins. These proteins are associated with the maturation and functionality of NK cells, making this marker an important indicator of immune health and activity.

What Are CD57+ CD16+ NK Cells?

• CD57+: Marks terminally differentiated or mature NK cells, often with enhanced cytotoxic (cell-killing) capabilities.
• CD16+: Facilitates antibody-dependent cell-mediated cytotoxicity (ADCC), enabling NK cells to target and destroy abnormal cells effectively.

These cells play a critical role in the immune system by:

• Identifying and destroying virus-infected and cancerous cells.
• Regulating immune responses to maintain a balanced defense.

The marker % CD57+ CD8+ T cells provides insightful data into an individual's immune status, specifically reflecting the subset of natural killer T cells (NKT-like cells) that exhibit both CD57 and CD8 markers.

CD57, a marker for terminal differentiation, is expressed on a subset of T cells that have undergone extensive proliferation and are associated with senescence and a high degree of cytotoxic potential.

CD8+ T cells, on the other hand, are crucial components of the adaptive immune system, responsible for directly killing infected or cancerous cells.

The co-expression of CD57 on CD8+ T cells marks a highly differentiated cell population with potent cytotoxic function but reduced proliferative capacity.

The proportion of all T cells that are CD8 cells.

CD8 cells are also called cytotoxic T-lymphocytes. They help fight cancer and germs that live inside your cells (intracellular pathogens).

The CD8 percentage is sometimes more reliable than the absolute count of CD8 because it tends to vary less.

The CD57 test is offered in some clinical laboratories and is being used by some health practitioners to evaluate and follow patients diagnosed with chronic Lyme disease.

The % Cytotoxic (CD8) T Cell marker reflects the proportion of CD8+ T cells among total lymphocytes or T-helper cells. CD8+ T cells, also known as cytotoxic T lymphocytes (CTLs), are a critical component of the adaptive immune system. Their primary role is to directly attack and destroy infected, cancerous, or damaged cells, particularly those harboring intracellular pathogens like viruses.

CD8+ T cells are activated upon recognizing antigens presented by MHC Class I molecules on the surface of target cells. Once activated, they release cytotoxic granules containing perforin and granzymes, which induce apoptosis in the target cells.

The percentage of Cytotoxic NK (Natural Killer) cells expressing CD16+. CD16+, also known as FcγRIII, is a low affinity receptor for the Fc region of immunoglobulins G (IgG), found on the surface of NK cells, and plays a pivotal role in antibody-dependent cellular cytotoxicity (ADCC). This mechanism is crucial for the immune system's ability to target and eliminate cells that are infected by pathogens or transformed malignantly.