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 Mickey how are you? when undetectable it means that the virus is no longer replicating in the body. When the virus is not replicating it can’t be effected by treatment. These cells that have the virus when dormant are considered latent. The cells is infected but the virus is not active.
When the virus is not active it is not damaging/killing the cell. Regardless of what cell type HIV is in. If it is not replicating, it cannot cause damage.
Hi.
When hiv positiv peson reach undetectible level of virus, where is remaining virus located in our body?
Why it is untouchable from medical side?
Can this small amount of virus destroy our cells, except cd4? For example brain cells?
Hi Lemah, there are no drug interactions between HIV meds and any sort of herbs or spices being used to season food..
Dear Josh it’s Lemah, trust you well. Just wanted to find out please if cayenne pepper have any negative effects to ARVs? Thanks Lemah
Hi Lucky, the HIV tests are negative, so you do not have HIV. About 2-3% percentage of the general population have a CD4 count that is less than 450. This is perfectly normal. Please talk to a doctor if you are worried about ther symptoms, they are not related to HIV.
Hi , my CD4 count is 484 , Cd8 count is 298 , CD4:CD8 Ratio is 1.63 , Hiv 3rd gen antibody test negative after 2 years from exposure date ,Hiv 4th gen antibody and antigen test Negative, Hiv 1/Hiv2 Qualitative PCR RNA test negative.
Is this hiv as cd4 count is below 500 ?
Hiv tests are negative plus ratio is greater than 1 .
Questions is that I have symptoms, permanent swollen lymph nodes tiny painless, rashes everyday on forehead and the back and high triglycerides, it wasn’t like that before
Hi Marie, is this CD4%? A low CD8 count is not associated with HIV. Has your doctor investigated your son’s health for reasons that could have caused this?
hola mi hijo tiene un rango de cd4 normal de 38.7
PERO el cd8 es muy bajo segun el laboratorio es demasiado bajo 18.1
Hi my son has a normal CD4 range of 38.7
BUT cd8 is too low according to the lab is too low 18.1
Hi Lucky, no this does not mean you have HIV. A healthy CD4 count range is 430 – 1690. A CD4 count below 500 does not mean you have HIV. Your tests are conclusive. You do not need any further testing. You are HIV negative.
Hi , my CD4 count is 484 , Cd8 count is 298 , CD4:CD8 Ratio is 1.63 , Hiv 3rd gen antibody test negative after 2 years from exposure date ,Hiv 4th gen antibody and antigen test Negative, Hiv 1/Hiv2 Qualitative PCR RNA test negative.
Is this hiv as cd4 count is below 500 ?
Hiv tests are negative plus ratio is greater than 1 .