Flow Cytometry - CD8 ( Suppressor T Cell Marker) *
Also Known As
Test Parameters Included
- CD8+ T Lymphocyte Count (cells/μL) and Percentage (%) of total lymphocytes
- Pathologist Immunology Remark - interpreted alongside CD4/CD8 ratio for immune assessment
Department
Methodology
Sample Required
Preparation
Schedule Report
24-48 Hours
Emergency Report
Yes
Frequently Asked Questions
What does CD8 test measure?
CD8 flow cytometry quantifies cytotoxic and suppressor T lymphocytes, which play a key role in fighting viral infections and controlling immune responses.
Is fasting required for CD8 test?
No fasting is required. The test can be performed at any time during lab hours.
Why is CD8 tested along with CD4?
CD4 and CD8 are measured together to calculate the CD4/CD8 ratio, which helps assess immune health, monitor HIV progression, and evaluate autoimmune or immunodeficiency conditions.
What causes low CD8 count?
Low CD8 levels may occur with certain viral infections, immunosuppressive therapy, corticosteroid use, or bone marrow disorders.
What causes high CD8 count?
Elevated CD8 counts are commonly seen in viral infections such as EBV, CMV, HIV, and hepatitis, as well as in certain autoimmune conditions.
How is the sample collected?
The sample is collected via venipuncture into an EDTA or Heparin tube, or from bone marrow aspirate, and analyzed using flow cytometry.
Test Description
Test Code
FCM27
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