CD4/CD8, Flowcytometry Test
About CD4/CD8, Flowcytometry Test
| Field | Value |
|---|---|
| Also Known As | CD4/CD8 Ratio Test, T-Lymphocyte Subset Panel, T-Cell Subset Analysis, Helper-Suppressor Ratio, Lymphocyte Immunophenotyping |
| Sample Type | Venous blood (whole blood) |
| Fasting Required | No |
| Report Time | Within 24 to 48 hours |
| Recommended For | All genders and ages; primarily adults with suspected or confirmed immune disorders |
| Price | Starting at ₹2,000 |
What Is a CD4/CD8 Flowcytometry Test?
The CD4/CD8 Flowcytometry test is a blood test that counts two key types of white blood cells: CD4 helper cells and CD8 cytotoxic cells. It uses a laboratory technique called flow cytometry, which identifies and counts these cells with precision. Doctors typically order this test to assess how well the immune system is functioning. It is also known as the CD4/CD8 Ratio Test or T-Lymphocyte Subset Panel, and it uses a sample of venous blood drawn from the arm.
What Does a CD4/CD8 Flowcytometry Test Measure?
This test analyses specific white blood cells called T-lymphocytes and calculates the relationship between two subgroups. Here is what each parameter represents:
| Parameter | What It Tells You |
|---|---|
| CD4+ T-cells (Helper T-cells) | These cells lead the immune response by signalling other immune cells into action against infections |
| CD8+ T-cells (Cytotoxic T-cells) | These cells directly destroy virus-infected cells and abnormal cells (such as cancer cells) |
| CD4/CD8 Ratio | Calculated by dividing the CD4 count by the CD8 count; for example, a ratio of 2 means there are 2 CD4 cells for every 1 CD8 cell |
| CD4 Percentage | The proportion of CD4 cells out of the total number of lymphocytes, expressed as a percentage |
| CD8 Percentage | The proportion of CD8 cells out of the total number of lymphocytes, expressed as a percentage |
Why Is a CD4/CD8 Flowcytometry Test Done?
This test is ordered when a doctor needs to evaluate the health of a patient's immune system. It helps identify, monitor, and manage a range of conditions affecting immunity.
Common Symptoms That May Require This Test
- Frequent or unusual infections that do not resolve easily
- Swollen lymph nodes (small glands in the neck, armpits, or groin)
- Chronic diarrhoea without a clear cause
- Unexplained weight loss
- Persistent fatigue
- Recurrent fevers
- Night sweats
Conditions This Test Can Help Detect
The CD4/CD8 Flowcytometry test can help identify or monitor several conditions, including:
- HIV/AIDS, where it guides treatment decisions and tracks immune health
- Infectious mononucleosis and other viral infections
- Chronic lymphocytic leukaemia (a type of blood cancer)
- Hodgkin disease (a cancer of the lymphatic system)
- Aplastic anaemia, a condition where the bone marrow does not produce enough blood cells
- Neurological disorders such as multiple sclerosis and myasthenia gravis
- Sarcoidosis, a disease that causes inflammatory lumps called granulomas
- Primary immunodeficiency disorders, including DiGeorge syndrome
CD4/CD8 Flowcytometry Test for Chronic Disease Monitoring
For patients living with HIV and receiving antiretroviral therapy (ART), this test is repeated at regular intervals to track how well the immune system is responding to treatment. Guidelines recommend testing every 3 to 4 months for patients with lower CD4 counts, and every 6 months once the CD4 count stabilises above 300 cells/mm³ with effective viral suppression. With successful treatment, CD4 counts are expected to rise by at least 50 cells per microlitre within the first 4 to 8 weeks and by approximately 100 to 150 cells per microlitre from baseline at one year.
How to Prepare and What to Expect
No special preparation is needed for this test, but a few simple steps will help the process go smoothly.
Do You Need to Fast?
No, fasting is not required. You can eat and drink normally on the day of your test. Follow your usual routine unless your doctor has given you different instructions.
Practical Tips Before Your Test
- Tell your doctor about all medications and supplements you are currently taking, as some can affect results.
- Avoid excessive alcohol consumption in the days before your test.
- Drink enough water to stay well hydrated; this makes the blood draw easier.
- Wear clothing with sleeves that can be rolled up easily.
Step-by-Step Procedure
- A trained phlebotomist (a person trained to draw blood) cleans a small area on your arm or hand with an antiseptic wipe.
- A fine needle is gently inserted into a vein to draw a small amount of blood.
- The blood is collected into a special tube that contains a preservative to keep the sample stable.
- The tube is inverted several times gently immediately after collection to mix the contents properly.
- The sample is kept at room temperature; it must not be refrigerated or frozen.
- Your sample is then sent to the laboratory and should reach the lab within 24 hours of collection to ensure accurate results.
Factors That Can Affect Accuracy
Several factors can influence the result of this test. These include:
- Active viral infections or tuberculosis
- Use of corticosteroid medications
- Time of day the sample is collected (CD4 counts tend to rise through the day)
- Dehydration or poor sample handling
- Active smoking and advanced age
- Hormonal changes and environmental temperature
Understanding Your CD4/CD8 Flowcytometry Test Results
Your results should always be reviewed by a doctor who knows your full health history. The table below shows the general reference ranges used for this test:
| Parameter | Normal Range | Unit |
|---|---|---|
| CD4 Absolute Count | 500 to 1,200 | cells/mm³ |
| CD8 Absolute Count | 150 to 1,000 | cells/mm³ |
| CD4/CD8 Ratio | 1.0 to 3.0 | ratio |
| CD4 Percentage | 35 to 55 | % |
| CD8 Percentage | 20 to 35 | % |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain circumstances can affect how results are interpreted. Your doctor will consider these when reviewing your test:
- In pregnant women with HIV, higher overall white blood cell counts can affect the proportion of CD4 cells, which may alter the ratio reading.
- In older adults, the CD4/CD8 ratio tends to decline naturally with age as part of age-related changes in immune function.
- Active smokers may show altered CD4/CD8 ratios compared to non-smokers.
- Since CD4 counts vary by time of day, tests ordered for monitoring should ideally be taken at a consistent time.
How to Maintain Healthy Levels
While specific medical management is your doctor's responsibility, the following general habits support immune health:
- Eat a varied diet with plenty of fruits, vegetables, and lean proteins to provide your body with key nutrients for immune function.
- Prioritise regular, restful sleep and find effective ways to manage everyday stress.
- Avoid smoking and limit alcohol, as both can negatively affect immune cell counts over time.
Lupin Diagnostics CD4/CD8, Flowcytometry Test Price and Home Collection
The CD4/CD8 Flowcytometry test price starts at approximately ₹2,000, with home sample collection available across cities. The table below shows approximate prices in key Indian cities:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹2,000 |
| Chennai | ₹2,000 |
| Hyderabad | ₹2,000 |
| Bangalore | ₹2,000 |
| Kolkata | ₹2,000 |
| Pune | ₹2,000 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sample collection for the CD4/CD8 Flowcytometry test across multiple cities, so you can get tested without visiting a centre. All samples are processed in NABL-accredited laboratories by trained and experienced staff. Your digital report is sent directly to you via email or WhatsApp once ready.
Frequently Asked Questions
This test measures the levels of two key immune cells, CD4 helper T-cells and CD8 cytotoxic T-cells, and calculates the ratio between them. It is used primarily to assess immune function, monitor HIV/AIDS treatment, and investigate other immune-related conditions. Your doctor will analyse the results alongside your full clinical picture.
No, fasting is not required. You can eat and drink as normal before the test. Unless your doctor gives specific instructions, there is no need to change your diet or routine on the day of collection.
A ratio below 1.0 suggests that CD4 cells are reduced relative to CD8 cells. This pattern is common in HIV infection, where CD4 cells are specifically targeted by the virus, and may also be seen in certain viral infections, blood cancers, or following immunosuppressive therapy. Your doctor will explain what the result means for your specific situation.
For HIV-positive patients on antiretroviral therapy, this test is typically recommended every 3 to 4 months during the first one to two years of treatment if CD4 counts are below 300 cells/mm³. Once counts stabilise, testing every 6 months is generally sufficient. Your treating doctor will advise a schedule suited to your needs.
Yes. Conditions such as infectious mononucleosis, sarcoidosis, chronic lymphocytic leukaemia, Hodgkin disease, aplastic anaemia, and neurological disorders like multiple sclerosis can all affect the CD4/CD8 ratio. Age, smoking, and certain medications may also influence the result.
Yes, Lupin Diagnostics offers home sample collection for this test in multiple cities across India. A certified phlebotomist visits your home at a time that suits you, and your sample is processed in an accredited laboratory. You can book easily through the Lupin Diagnostics website.
CD4/CD8, Flowcytometry Test
