• Absolute CD4 Count: Measures the total number of Helper T-cells per microliter of blood. This is the primary indicator of immune "strength."
• Absolute CD8 Count: Measures the number of "Killer" T-cells. These often increase during viral infections as the body tries to fight back.
• CD4 Percentage (%) & CD8 Percentage (%): The percentage of total lymphocytes that are CD4 or CD8. This value is often more stable than absolute counts and is less affected by daily stress or minor illnesses.
• CD4 / CD8 Ratio: This is a vital calculation. In a healthy immune system, the ratio is usually above 1.0 (more CD4 than CD8). In chronic viral infections like HIV, the ratio "inverts" (becomes less than 1.0).

Why do I need both CD4 and CD8 counts?

While CD4 shows your immune strength, the CD8 count and the resulting "Ratio" provide a clearer picture of how hard your immune system is working or how much damage has been done.

What is a "Normal" CD4/CD8 ratio?

A healthy ratio is typically between 1.0 and 4.0.

Why does the ratio "invert" in HIV?

Because HIV kills CD4 cells and triggers the production of more CD8 cells to fight the virus, the ratio flips to less than 1.0.

Does a low CD4 count mean I have AIDS?

Not necessarily. AIDS is defined by a CD4 count below 200 or the presence of specific opportunistic infections. Many people with low counts live healthy lives with proper treatment.

Can stress lower my CD4 count?

Extreme stress can cause temporary drops, but doctors look for long-term trends over several months rather than single results.

How often should I get tested?

For stable patients on treatment, testing is usually done every 6 months.

Why is the report 24–48 hours?

Flow Cytometry is a complex molecular process that requires laser calibration and expert interpretation by a pathologist.

Can ART bring my ratio back to normal?

Yes, effective treatment can significantly increase the CD4 count and improve the ratio over time.

What if my count is low but I feel fine?

The immune system can be weakened long before you feel sick. The test is designed to catch this "silent" phase so treatment can begin.

Can I take this test during a cold?

It is better to wait 2 weeks after recovery to get an "accurate" baseline of your immune system.

Does smoking affect these results?

Yes, smoking can cause chronic inflammation that may elevate CD8 counts and alter the ratio.

Why is blood collected in EDTA?

EDTA prevents the blood from clotting, which is essential because the machine must count individual, free-moving cells.

Is this test used for cancers?

Yes, it is used to help diagnose and monitor certain types of blood cancers like Lymphoma and Leukemia.

Does age affect the counts?

Yes, children naturally have much higher CD4 counts than adults. Their results are interpreted differently.

Is the test result confidential?

Absolutely. At Dr. Patho, all immune and HIV-related testing is protected by strict privacy protocols.