Written on February 19, 2024 by Jillian Foglesong Stabile, MD, FAAFP. To give you technically accurate, evidence-based information, content published on the Everlywell blog is reviewed by credentialed professionals with expertise in medical and bioscience fields.
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Human immunodeficiency virus (HIV) is an infectious virus that can be spread through contact with bodily fluids like blood and semen. This virus attacks the immune system and can lead to acquired immunodeficiency syndrome (AIDS).[1] HIV originated as early as the late 1800s in chimpanzees in Central Africa. It began to be seen in the United States in the mid to late 1970s.
In the United States, an estimated 1.2 million people have HIV, and more than 150,000 of them may not realize that they are infected.[2] Over 30,000 people in the U.S. receive a diagnosis of HIV each year. With the infection being this common, you may be wondering when to test for HIV.
HIV can affect anyone of any age, race, ethnicity, or gender. However, certain factors can increase your risk of becoming infected, including [3]:
HIV infection occurs in stages: acute infection, chronic infection, and AIDS.[4]
Acute HIV infection is the earliest stage of the infection and occurs in the first few weeks. During this stage, the virus multiplies quickly and spreads through the body attacking the immune system. You may have flu-like symptoms, including [5]:
Chronic HIV infection can last for years. This stage of the infection doesn’t generally cause any symptoms. HIV continues to multiply in the body, but the rate is much lower. Without treatment, HIV can take 10 years or more to advance to AIDS, but this can be faster in some people. With treatment, it can take several decades to progress to AIDS. While it is always possible to spread HIV to others during any stage, treatment decreases the risk of transmitting the virus. If you respond well to treatment and your viral load is undetectable, the risk of transmission drops to almost zero.[6]
When HIV progresses to its most advanced form, AIDS is the result. HIV severely damages the immune system. This diagnosis is made when the counts of certain immune cells in the body (CD4) drop below 200 cells/mm^3.[4] AIDS is also diagnosed if certain infections are present [7]:
AIDS is associated with weight loss, fever, sweats, rashes, swollen lymph nodes, and other symptoms specific to the types of infections that may be present.
Testing options include the 4th generation test, which looks for the antibodies your body forms to fight against HIV (both types 1 and 2) and also for the p24 antigen. This allows for earlier detection of the virus.[8] If testing is positive, confirmatory testing is done to ensure accurate results. Outside of the normal clinical environment, oral swab rapid testing through enzyme-linked immunosorbent assay (ELISA) antibody testing is sometimes done with additional confirmatory testing. This allows for community access to testing outside of the normal clinical environment.
All of this information brings us back to our original question, when should you be tested for HIV? Even if you are in the lowest risk category, you should get tested. The Centers for Disease Control and Prevention (CDC) recommends getting tested at least once if you are between the ages of 13 and 64.[9]
If you are at increased risk of becoming infected with HIV, then you should get tested at least once a year. Some of these risk factors include [9]:
People who are pregnant should be tested for HIV in early pregnancy. Treatment in pregnancy can help prevent transmission to the baby during pregnancy and delivery. If you are at a high risk for exposure to HIV, you should be retested in the third trimester.[10]
If you’ve been exposed to HIV, you should seek care immediately. Certain medications can be used after exposure to try to decrease the risk of becoming infected (post-exposure prophylaxis). Antibody testing for HIV can find HIV antibodies 23-90 days after exposure. Antigen/antibody combination testing can detect HIV between 18 and 90 days after exposure depending on which tests are performed. Nucleic acid testing (NAT) can detect HIV as soon as 10 days after exposure. If initial testing is negative, healthcare providers recommend retesting after the window period for the test you’ve had done.[11]
STDs can have a long-term impact on your health. If untreated, STDs can cause serious health conditions and, in some cases, can be life-threatening. Everlywell has a range of testing options available as well. Consider HIV testing and other testing through our at-home lab testing membership to help you take control of your health. We also have clinicians who can provide telehealth visits to discuss your situation and advise you on how to protect yourself.
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