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CD4/CD8 Ratio details
What CD4/CD8 Ratio shows
This ratio compares two types of T-cells — CD4 'helper' cells and CD8 'cytotoxic' cells — that work together as part of your immune response. It's used most often to monitor immune health in HIV, where CD4 cells are specifically targeted and depleted by the virus, causing the ratio to drop as the disease progresses; an improving ratio on treatment is a reassuring sign. It's also used, less commonly, in evaluating certain other immune or autoimmune conditions and after bone marrow or organ transplants, where immune balance is important to track. A normal ratio generally reflects balanced immune function, while an abnormal one prompts a closer look at the individual CD4 and CD8 counts.
Tests that include CD4/CD8 Ratio
The CD4:CD8 Ratio Profile measures the percentage and absolute counts of CD4+ and CD8+ cells, along with their ratio. This test is valuable for assessing and monitoring immune system function, as changes in these cell counts and ratios can indicate alterations in immune status.
Biomarkers
- Basophils (%) The percentage of your white blood cells that are basophils, a cell type involved in allergic and inflammatory responses.
- CD4/CD8 Ratio Compares two types of immune T-cells. Used to assess immune system balance, especially in HIV monitoring and some autoimmune or infectious conditions.
- Eosinophils (%) The percentage of your white blood cells that are eosinophils, elevated with allergies, asthma, or parasitic infections.
- Hematocrit The percentage of your blood volume made up of red blood cells. Used to help diagnose anemia or polycythemia (excess red blood cells).
- Hemoglobin The oxygen-carrying protein in your red blood cells. A core marker for diagnosing anemia and other blood disorders.
- Immature Granulocytes (%) The percentage of young, not-yet-mature white blood cells in circulation — a rise can be an early sign of infection or bone marrow stress.
- Lymphocytes (%) The percentage of your white blood cells that are lymphocytes, key immune cells including T-cells, B-cells, and NK cells.
- Monocytes (%) The percentage of your white blood cells that are monocytes, cells that help fight infection and clear damaged tissue.
- Neutrophils (%) The percentage of your white blood cells that are neutrophils, a first-line defense against infection.
- Absolute CD4+ Cells Counts CD4 'helper' T-cells, a key part of your immune system. Widely used to monitor immune health in HIV and other immune conditions.
- Absolute CD8+ Cells Counts CD8 'cytotoxic' T-cells, immune cells that help destroy infected or abnormal cells. Used to assess immune status.
- Basophils The number of basophils, a type of white blood cell involved in allergic and inflammatory responses, in your blood.
- CD4 (%) The percentage of your lymphocytes that are CD4 helper T-cells, used alongside the absolute CD4 count to assess immune function.
- CD8 (%) The percentage of your lymphocytes that are CD8 cytotoxic T-cells, used alongside the absolute count to assess immune function.
- Eosinophils The number of eosinophils, a white blood cell type involved in allergic reactions and parasite defense, in your blood.
- Immature Granulocytes The number of young, not-yet-mature white blood cells in circulation — a rise can be an early sign of infection or bone marrow stress.
- Lymphocytes The number of lymphocytes, white blood cells central to your immune response (including T-cells, B-cells, and NK cells), in your blood.
- Mean Corpuscular Hemoglobin Concentration (MCHC) Mean Corpuscular Hemoglobin Concentration — the average concentration of hemoglobin within your red blood cells, used to help classify types of anemia.
- Mean Corpuscular Hemoglobin (MCH) Mean Corpuscular Hemoglobin — the average amount of hemoglobin per red blood cell, used to help classify types of anemia.
- Mean Corpuscular Volume Mean Corpuscular Volume — the average size of your red blood cells, a key value used to help determine the cause of anemia.
- Monocytes The number of monocytes, white blood cells that help fight infection and clear damaged cells, in your blood.
- Neutrophils The number of neutrophils, the most abundant white blood cell type and a first-line defense against infection, in your blood.
- Platelet Count Cell fragments that help your blood clot. Counted to screen for bleeding or clotting risk and various blood disorders.
- Red Blood Cell Count (RBC) Red blood cell count — the number of oxygen-carrying red blood cells in your blood, used to help diagnose anemia or polycythemia.
- Red Cell Distribution Width (RDW) Red Cell Distribution Width — measures how much your red blood cells vary in size, helpful for narrowing down the cause of anemia.
- White Blood Cell Count (WBC) White blood cell count — the total number of white blood cells in your blood, key immune cells. Used to help detect infection, inflammation, and other blood disorders.
T-lymphocyte count assists in evaluating cellular immunocompetency.
Biomarkers
- CD4/CD8 Ratio Compares two types of immune T-cells. Used to assess immune system balance, especially in HIV monitoring and some autoimmune or infectious conditions.
- Absolute CD19+ Cells Counts the number of CD19+ B cells per volume of blood, the immune cells that make antibodies, used to assess immune system health.
- Absolute CD3+ Cells Counts the number of CD3+ T cells per volume of blood, the main immune cells that direct and carry out immune responses, to assess immune health.
- Absolute CD4+ Cells Counts CD4 'helper' T-cells, a key part of your immune system. Widely used to monitor immune health in HIV and other immune conditions.
- Absolute CD8+ Cells Counts CD8 'cytotoxic' T-cells, immune cells that help destroy infected or abnormal cells. Used to assess immune status.
- CD19 (B Cells) (%) Shows CD19-positive B cells as a percentage of your lymphocytes, helping assess the antibody-producing part of your immune system.
- Mature T Cells (CD3) (%) Shows CD3-positive mature T cells as a percentage of your lymphocytes, helping assess the T cell part of your immune system.
- CD4 (%) The percentage of your lymphocytes that are CD4 helper T-cells, used alongside the absolute CD4 count to assess immune function.
- CD8 (%) The percentage of your lymphocytes that are CD8 cytotoxic T-cells, used alongside the absolute count to assess immune function.
- Lymphocytes The number of lymphocytes, white blood cells central to your immune response (including T-cells, B-cells, and NK cells), in your blood.
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