Q and A

Question

What is a normal CD4 count, CD4% and CD4:CD8 ratio?

Answer

After finding out you are HIV positive, your doctor will run several blood tests.

One will be for your immune system and will include your CD4 and CD8 count. Of these, the CD4 count is the most important main result but the CD4% and CD4:CD8 ratio are also sometimes useful.

This Q&A include information about these cels and about interpreting the test results.

CD4 cells are a type of blood cell that is part of your immune system. They are a type of white blood cell (lymphocyte). CD4 cells are sometimes called T-helper cells or T-cells

There are two main types of T-cells.

  1. CD4 cells, also called T4 cells, are “helper” cells. They lead the attack against infections.
  2. CD8 cells, (T8 cells), are “suppressor” cells that complete the immune response. CD8+ cells can also be “killer” cells that kill cancer cells and other cells that are infected by a virus.

CD4 and CD8 counts

The normal ranges for CD4 and CD8 counts vary depending on the lab and test. On average, the normal CD4 range for an HIV negative person is between 460 and 1600. This is an average. Anywhere in this range is good.

Although generally a higher CD4 is good, an HIV negative person with a normal CD4 count of 1200 is not more healthy than someone whose normal count is 400.

The exact CD4 count is not so important. CD4 counts can vary from day to day and even from hour to hour. So the general CD4 result is more important than the exact number.

A normal CD8 range is from 150 to 1000. This test is not used as much but the results come together. It is more important to know your CD4 count than your CD8 count.

CD4 percentage (CD4%)

If you get a CD4 count that is ever unexpectedly high or low, then your CD4% (CD4 percentage) can show whether this is a real change in immune function. The CD4% is a more stable marker than the absolute CD4 count.

The CD4 percentage refers to percentage of total lymphocytes that are CD4 cells. If your test reports CD4% = 34%, that means that 34% of your lymphocytes are CD4 cells.

The average normal CD4% for HIV negative adults is about 40%. However, as with CD4 counts and other test, the range for a “normal” result in an HIV negative person is also wide – from about 25% to 65%.

CD4:CD8 ratio

The CD4:CD8 ratio is also sometimes used, but less often. This is a measure of how balanced your immune function is. This calculated by dividing the CD4 result by the CD8 result.

In HIV negative people, the normal range for the CD4:CD8 ratio is between 0.9 and 1.9. This means that there are about 1 to 2 CD4 cells for every CD8 cell.

When not on HIV treatment, just like the CD4 count and CD4%, the CD4:8 ratio drops over time. Eventually, unless you start treatment, there will be more CD8 cells than CD4 cells (i.e. the ratio drops to less than 1.0).

The CD4:CD8 ratio might be better at predicting future risk in people whose CD4 count is high (above 500 cells/mm3). However, not all studies agree on this.

Other studies have shown that starting ART soon after HIV infection has a much higher chance of keeping the CD4:CD8 ratio higher than 1.0.

Note: this answer was last updated in January 2018 from a post that was originally published in December 2006.

330 comments

  1. Terri

    For several years my cd4 cell count has been around 200. I am HIV negative. I suffer from fevers of around 101.5 that occur weekly. Are the fevers related to the cell count?

  2. Lisa Thorley
  3. Raghuvarma

    Hello I have cd4 count 513 and cd8 391and cd3 1043 does it a symptom of HIV. I got HIV tests also after exposer of 3months it showed negative.. am feeling lot of weakness unbalanced dizziness numbeness in whole body breathing difficulty insomnia

  4. Joe

    Thanks Lisa for your patience. You put my mind to rest. I am already doing another test in another lab, and waiting for the results. I’ll keep you posted.

  5. Lisa Thorley

    Hi Joe,

    Because your viral load is undetectable the meds are working, and working well. Yes, there has been a drop in your CD4 count. However, CD4s can and do fluctuate. Please see here for more info:

    https://i-base.info/qa/424

    If you are however worried, if its possible you should have it checked again. You are though doing well.

  6. Joe

    My cd4 is 269// 28%

  7. Joe

    My viral count is now less than 20

  8. Lisa Thorley

    Hi Joe,

    What’s your most resent CD4 count? Is your viral load still undetectable?

  9. Joe

    Hi. My viral load was 41000 and my Cd4 was 428//31%.
    After 8 months of treatment my viral load was negative and cd4 488// 41% which was a great comfort to me with a ratio of 1.4 . This new results turns everything around. My ratio is back to 0.8, as it was before I started treatment. Please advise we , what should I do?

  10. Lisa Thorley

    Hi Joe,

    What was your CD4 count when you started meds? And your viral load? What meds are you on?

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