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Soon after you are diagnosed with the human immunodeficiency virus (HIV), you will have other blood tests. These tests help your doctor see how your body is responding to the virus. They also help show how well your treatment is working.
These tests may be done every 3 to 6 months. The first set of tests serves as a baseline. Your doctor can compare the results of future tests with the first set. Your doctor will look at the results of several tests over time to see if the infection is getting better or worse.
These tests include the viral load test and the CD4 count. Your doctor may order one or both tests.
A viral load test measures how much HIV is in your blood. It measures the amount of the genetic material (RNA) of the virus.
There are several methods that a lab can use to do this test. Each method reports the results in a different way. But all of the methods give you important information about how to treat your disease.
This test is done to:
Viral load results are reported as the number of HIV copies in a millilitre (copies/mL) of blood. Each virus is called a "copy" because HIV increases by making copies of itself.
Your numbers may go up or down slightly from test to test. And the specific numbers depend on which method the lab used to measure your viral load. But in general:
HIV destroys CD4 cells. CD4 cells are a type of white blood cell. White blood cells are important in fighting infections.
A CD4 count is a blood test to find the number of CD4 cells. This number shows if your HIV has progressed to AIDS. It also helps find out if other infections may occur. These other infections are often called opportunistic infections. They occur in people with weak immune systems. They usually don't occur in people with healthy immune systems.
CD4 counts are done to:
Results are reported as the total number of CD4 cells in a millilitre (cells/mL) of blood. You may also see a percent number. That number is the percentage of white blood cells that are CD4 cells. The total and the percent numbers go up and down together.
The pattern of CD4 counts over time is more important than any single count. As the count rises, the healthier your immune system is. As the count drops, it becomes more likely that AIDS will develop.
The ranges listed here are just a guide. The ranges vary from lab to lab. Your lab may use a different range.
A CD4 count range of:
Your doctor will talk with you about the results of these tests and what they mean. He or she will answer any questions you have. Your doctor may also:
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
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Current as of: February 11, 2020
Author: Healthwise Staff
Medical Review:Elizabeth T. Russo MD - Internal Medicine & Peter Shalit MD, PhD - Internal Medicine
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