Window Period of HIV Testing | Anonymous HIV Test Bangkok, Pattaya, Phuket, Chiang Mai Thailand
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Written by Dr.Love on 16 May 2016, Last medically reviewed by Dr.Deyn on May 24, 2022
Window Period of HIV Testing
What Is Window Period?
The HIV window period is the time between a potential HIV infection and the time an individual gets tested with an accurate result. After HIV enters the body, the body will produce an immunological response after an HIV infection. This process takes time.
So when an HIV test detects specific antibodies produced in the human body when the body is fighting the virus. The antibodies help indicate the presence of an infection. 99% of HIV-infected individuals would be detectable within 57 days of exposure using the normal HIV screening technique.
Why Is the Window Period Important?
Different HIV tests have different HIV window periods, as different tests detect different indicators of HIV infection during the HIV development cycle. As HIV develops in the human body, HIV antibodies and antigens (protein) will develop too. Different HIV tests thus detect different antibodies at different stages. When a wrong HIV screening is done during the window period, a person can be infected with HIV but the test results may still show negative. This is called a false negative HIV screening result.
Why Is It Important to Detect HIV Early?
Early anonymous HIV testing leads to early HIV treatment, helping to control the spread of HIV. This is not only because people who test positive can start taking proper medications to prevent HIV infections from progressing to AIDS, but also because it can protect their partners from being infected.
Window Period of Each Type of HIV Testing
Most tests are equally accurate when conducted by a healthcare professional who meets the standard. The primary differences between various HIV tests lie in their optimal timing for accuracy and reliability. Each test employs a distinct method for detecting HIV, which can result in some tests requiring a longer period for the body to react, leading to more reliable results.
Test type
Testing method
Window period
Main benefits
3rd Generation test (HIV rapid test)
Test for antibodies, which looks for body's reaction to the virus.
3–12 weeks (Longest)
Usually the cheapest option and give results quickly.
4th Generation test (HIV rapid test)
Test for antibodies and antigens, which looks for body's reaction to the virus and the enzyme produced by the virus.
14–28 days (Shorter)
Much shorter window period than 3rd generation test and give a much quicker result than PCR tests.
PCR Test (HIV RNA PCR)
Test for the the genetic material of the virus, which looks for the virus itself.
7–14 days (Shortest)
Really short window period. Best for early detection in recent high risk activity. Used for confirmation test.
What If I Test Negative During the Window Period?
If you’re worried that you might have been infected in the window period, you’ll need to get tested again to be sure you don’t have HIV. If you think you might have been exposed within the last 72 hours, talk to your doctor right away about post-exposure prophylaxis (PEP), medications that can prevent infection.
Types of HIV Tests
Standard HIV Blood TestThis test uses blood that a technician takes from your vein and sends to a lab. It can find antibodies (proteins your immune system makes when you’ve been exposed to the virus) 23 to 90 days after infection.
Antibody/Antigen TestThese tests look for both antibodies and an antigen, a substance the virus makes before your immune system can start making antibodies. An antibody/antigen test that uses blood from a vein can find HIV 18 to 45 days after you’re exposed to the virus.
Newer antigen/antibody combination tests (you might hear them called “fourth generation” tests) can find HIV in 99% of people who are tested within 13 to 42 days of exposure. This test has become the standard HIV blood test in most labs.
Rapid Blood TestOne type looks for antibodies using a drop of blood from a prick of your fingertip. It’s about as accurate as a laboratory-based antibody test, but its window period could be longer -- between 18 and 90 days. An antibody/antigen test can also use blood from a prick of your fingertip. It may also take longer to turn positive than a laboratory-based antibody/antigen test. The window period for this test is 18 to 90 days.
Rapid Oral TestYou can do this quick, easy test at home. Just rub a swab in the area between your gums and teeth to collect a sample of oral fluid (it isn’t the same as saliva) for antibodies against HIV. If you’ve have had the virus for a while, the rapid oral test is highly accurate. But if you have a new infection, even if you got it in the past few months, the test won’t be as reliable. The window period is 23 to 90 days.
Urine TestThese also look for HIV antibodies, but they aren’t as accurate as other tests that check either your blood or oral fluid. Because it’s an antibody test, its window period is similar to that of a standard HIV test.
Nucleic Acid Tests (NAT/PCR)These tests look for HIV in a window period of around 10 to 33 days after infection. They screen for signs of the HIV virus itself, not your antibodies to it. You may also hear this called an HIV RNA or a viral load test. It uses blood taken from a vein. You probably won’t get this expensive test unless you have symptoms and the doctor thinks you have a recent infection. It’s most often used to see how people who already have HIV respond to treatment.
Under the Anonymous HIV Testing & Screening Programme, any local or foreign individual may walk-in or book an appointment
The anonymous HIV test is strictly confidential.
No personal information is required regardless of the HIV test results.
We are 100% private and not linked to the government system. The government will not know the results.
We do not have to report test results to the government. Your test results will be confidential.
Anonymous HIV Testing is available everyday, 365 days per year (Monday to Sunday, including public holidays) at PULSE CLINICS throughout Asia (Except in Singapore).
Simply approach the reception and indicate that you require an anonymous testing.
The reception will automatically process your request and provide guidance.
All discussions are kept discreet and confidential.
During your private consultation, you can speak to the doctor about your HIV-related concerns.
Your assigned or requested staff/doctor will administer the relevant HIV tests.
For more information about getting HIV test and treatment at PULSE Clinic, contact us at info.bkk@pulse-clinic.com or chat with us via one of the following platforms:
Dr.Deyn
