Question
What is a normal CD4 count, CD4% and CD4:CD8 ratio?
16 January 2018. Related: All topics, CD4 and viral load, Other tests.
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.
- CD4 cells, also called T4 cells, are “helper” cells. They lead the attack against infections.
- 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.
Hi Stanley,
Are these real test results or hypothetical? A normal CD4/8 ratio is between 1 and 4.
Does it mean if someone has CD4 600 and CD8 150 meaning a ratio of 4:1 then they are OK??? I think CD8 are equally important and absolute numbers of either CD4 or CD8 are important to analyse separately.
The factors that would cause your CD4/CD8 ratio to be high are the same as having a high CD4 count. A high CD4/CD8 ratio is an indication of a strong immune system. The only way to increase your CD4 count (and therefore your CD4/CD8 ratio) is to take antiretroviral treatment.
Please follow this link for more information about CD4 counts.
what are other conditions that can make an HIV individual have high ratios of CD4/CD8?
The only way you can know if someone is infected with HIV is by doing a test. For more information of tests please follow this link. A normal ratio is usually between 1 and 4.
What does CD4:CD8 ratio of 4.0 mean? Is the person infected with HIV or is it a normal count?
Um contagem de CD4 de 499 sem terap
CD4 COM 499 EUM BOM RESULTADO PARA N
If someone is HIV-negative, then they would not need HIV drugs. These drugs target HIV. They do not directly affect CD4 or CD8 counts.
Does the ratio of the CD4/CD8 matter in the person, because some clinicians just look at the number of cd4. But suppose someone is HIV-negative and has the CD4 250cell/ul and the CD8 is 125cells/ul, does it mean you can put him on ART?