What is HIV? What is AIDS?
HIV (human immunodeficiency virus) is a virus that attacks the immune system, the body’s natural defense system. Without a strong immune system, the body has trouble fighting off disease. Both the virus and the infection it causes are called HIV.
White blood cells are an important part of the immune system. HIV invades and destroys certain white blood cells called CD4+ cells. If too many CD4+ cells are destroyed, the body can no longer defend itself against infection.
The last stage of HIV infection is AIDS (acquired immunodeficiency syndrome). People with AIDS have a low number of CD4+ cells and get infections or cancers that rarely occur in healthy people. These can be deadly.
What causes HIV?
HIV infection is caused by the human immunodeficiency virus. You can get HIV from contact with infected blood, semen, or vaginal fluids.
- Most people get the virus by having unprotected sex with someone who has HIV.
- Another common way of getting the virus is by sharing drug needles with someone who is infected with HIV.
- The virus can also be passed from a mother to her baby during pregnancy, birth, or breast-feeding.
How is HIV diagnosed?
The U.S. Food and Drug Administration (FDA) has approved tests that detect HIV antibodies in urine, fluid from the mouth (oral fluid), or blood. If a test on urine or oral fluid shows that you are infected with HIV, you will probably need a blood test to confirm the results. If you have been exposed to HIV, your immune system will make antibodies to try to destroy the virus. Blood tests can find these antibodies in your blood.
Most doctors use a screening blood test. If the screening is positive (meaning that HIV antibodies are found), the blood sample is tested again to verify the result. If the second test is positive, a test called a Western blot is performed for further confirmation.
It may take as long as six months for HIV antibodies to show up in a blood sample. If you think you have been exposed to HIV but you test negative for it:
- Get tested again in six months to be sure you are not infected.
- Meanwhile, take steps to prevent the spread of the virus. If you are infected, you can still pass HIV to another person at this time.
Some people are afraid to be tested for HIV. But if there is any chance you could be infected, it is very important to find out. HIV can be treated. Getting early treatment can slow down the virus and help you stay healthy. And you need to know if you are infected so you can prevent spreading the infection to other people.
How is HIV treated?
The standard treatment for HIV is a combination of medicines called Highly Active Anti-Retroviral Therapy (HAART). Anti-retroviral medicines slow the rate at which the virus multiplies. Taking these medicines can reduce the amount of virus in your body and help you stay healthy.
It may not be easy to decide the best time to start treatment. There are pros and cons to taking HAART before you have symptoms. Discuss these with your doctor so you understand your choices.
First, to determine the best treatment regimen, your doctor may order an HIV Genotype test.
Next, to monitor the HIV infection and its effect on your immune system, or to check on your response to therapy, a doctor may order these tests:
- Viral Load, which shows the amount of virus in your blood.
- CD4+ Cell Count, which shows you how well your immune system is working.
If you have no symptoms and your CD4+ cell count is at a healthy level, you may not need treatment yet. Your doctor will repeat the tests on a regular basis to see how you are doing. If you have symptoms, you should consider starting treatment, whatever your CD4+ count is.
After you start treatment, it is important to take your medicines exactly as directed by your doctor. When treatment doesn't work, it is often because HIV has become resistant to the medicine. This can happen if you don't take your medicines correctly. Ask your doctor if you have questions about your treatment.
Treatment has become much easier to follow over the past few years. New combination medicines include two or three different medicines in one pill. Many people with HIV get the treatment they need by taking just one or two pills a day.
To stay as healthy as possible during treatment:
- Don't smoke. People with HIV are more likely to have a heart attack or get lung cancer.1,2 Smoking can increase these risks even more.
- Eat a healthy, balanced diet to keep your immune system strong.
- Get regular exercise to reduce stress and improve the quality of your life.
- Don't use illegal drugs, and limit your use of alcohol.
How can you prevent HIV?
HIV can be spread by people who don't know they are infected. To protect yourself and others:
- Practice safe sex. Use a condom every time you have sex (including oral sex) until you are sure you and your partner are not infected with HIV.
- Don't have more than one sex partner at a time. The safest sex is with one partner who has sex only with you.
- Talk to your partner before you have sex the first time. Find out if he or she is at risk for HIV.
- Get tested together and retested 6 months later. Use condoms in the meantime.
- Don't drink a lot of alcohol or use illegal drugs before sex. You might let down your guard and not practice safe sex.
- Don't share personal items, such as toothbrushes or razors.
- Never share needles or syringes with anyone.
Sonora Quest Laboratories is committed to the fight against HIV and AIDS, supporting various programs and fund-raising events through The Apothecary Shops, Aunt Rita’s Foundation, the Southern Arizona AIDS Foundation, and the Southwest Center for HIV/AIDS. Our expansive HIV test offerings allow us to assist doctors and patients in all stages of the disease.
To learn more about HIV/AIDS, talk with your doctor, go to your local health department, or visit:
1.“Human Immunodeficiency Virus (HIV) Infection.” Quest Diagnostics. Accessed 2 Feb. 2010. http://www.questdiagnostics.com/kbase/topic/major/hw151408/descrip.htm
2. Triant VA, et al. (2007). Increased acute myocardial infarction rates and cardiovascular risk factors among patients with HIV disease. Journal of Clinical Endocrinology and Metabolism. Available online: http://jcem.endojournals.org/cgi/rapidpdf/jc.2006-2190v1 (e-pub ahead of print).
3. Chaturvedi AK, et al. (2007). Elevated risk of lung cancer among people with AIDS. AIDS, 21(2): 207–213.
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