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How Long Before Hiv Can Be Detected

Definition Of Exclusion Criteria

Real Question: How Long Does it Take to Test Positive for HIV?

Blood donor eligibility is regulated by the Guidelines on the Collection of Blood and Blood Components and on Use of Blood Products . Criteria are defined for the permanent or temporary deferral from donation with respect to the transmission of HIV. Permanently deferred from donation are the following:

  • Persons with a confirmed HIV infection.

  • Persons with non-prescribed IV or IM drug use.

  • Persons whose sexual behaviour puts them at high risk of acquiring severe infectious diseases like HBV, HCV or HIV that can be transmitted by blood:

  • heterosexual persons with high-risk sexual behaviour, i.e. sexual contacts with multiple sex partners,

  • men who have sexual contacts with men

  • male and female sex workers.

Temporary deferral from donating blood is valid for persons:

  • who entered Germany from a country or a region, where they had been continuously resident for more than 6 months, with a comparatively high prevalence of HBV, HCV, HIV or HTLV-1/-2 infections,

  • who had sexual contacts with persons belonging to a group with an enhanced risk of infection with HBV, HCV, HIV and/or HTLV-1/-2 ,

  • with tattoos or body piercing.

How Will I Know If I Am Undetectable

You cant tell if you have an undetectable viral load simply by how healthy you look and feel. The only way to know that your viral load is undetectable is by regular viral load monitoring.

Viral load monitoring involves a simple blood test to measure how many particles of HIV there are in a small sample of your blood . From this you and your healthcare worker can understand how well your ART is working.

A low viral load means that your ART is working well and controlling your HIV. If you have an undetectable viral load, it means that the amount of HIV in your body is so low that you can’t pass it on to other people through sex.

The point at which a viral load is classified as being undetectable may vary across different countries depending on the tests available. But so long as your viral load is under 200 copies per millilitre, youre considered virally suppressed and unable to pass HIV on.

The frequency with which you are offered viral load testing may vary depending on where you are and the services available to you. The World Health Organization recommends that when first starting ART, you should have your viral load measured after the first 6 months of treatment and again at 12 months. After becoming undetectable you should still receive viral load testing at least every 12 months. Depending on the resources available and your particular health status, your health worker may recommend that your viral load is monitored more often than this.

How Long Do You Have To Wait After Unprotected Sex To Take An Hiv Test

By | Oct. 14, 2010, 11:04 a.m.


how long does it take after u have unprotected sex for u to get tested for hiv? can u get tested right away and know the results? or do u have to wait a certain amount of time.

HIV tests detect antibodies the immune systems response to infection. For the majority of people, HIV testing will be accurate at four to six weeks after possible infection. However, for some people it may take longer up to three months for detectable antibodies to develop. This is called the window period. During the window period, HIV tests can come back negative even though the person has the virus. HIV can be passed to other people during the window period. To make an appointment for HIV testing, contact your local Planned Parenthood health center. Tests are also available from most health care providers, hospitals, and health centers. Local, state, and federal health departments may offer free testing. The Centers for Disease Control and Prevention lists HIV testing locations and offers information about home testing. The site can also be accessed in Spanish.

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Donor History Questionnaire And Donor Interview

According to the haemotherapy guidelines, the state of health and pre-existing relevant diseases have to be assessed by using a donor history questionnaire and a confidential interview. This can help to identify and defer persons whose donation could represent a health risk to themselves or could be associated with the risk of transmitting a disease to others. For further queries and explanations a physician has to be available. The medical history should cover all issues of the donor selection criteria of the haemotherapy guidelines. These constitute a legally binding basis for decision-making in selecting donors. Since 2015 an updated standardised donor history questionnaire is available , and its application is recommended by Vote 41 of the German Advisory Committee Blood .

Perinatally HIV-infected children who since birth have been effectively treated with antiviral drugs for years may be antibody-negative due to early suppression of HIV replication and could theoretically become potential blood donors. They may have no measurable viral load in plasma but HIV DNA in their blood cells . By declaration of the HIV infection and/or disclosure of the continuous use of anti-retroviral drugs they are excluded from donating blood.

What Does The Hiv Test Involve


The Centers for Disease Control and Prevention recommend that all people between the ages of 13 and 64 be tested at least once for HIV. People with known risk factors should be tested yearly, or more frequently.

HIV tests are very accurate, but no test can detect the virus immediately after transmission. How soon a test can detect HIV depends on what the test is looking forantibodies, antigens, or the virus itself.

HIV testing uses a blood draw, a finger stick, or an oral swab. The type of sample used depends on the test.

These three types of diagnostic tests are used to detect HIV:

Antibody and antigen/antibody tests are typically used first because they are less expensive and easier to administer. They may also detect signs of HIV sooner. A NAT test may be used to confirm a positive result on an antibody or antigen/antibody test, or if these tests are negative and there is a strong suspicion for new HIV infection.

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What Is An Undetectable Viral Load


  • Taking antiretroviral treatment reduces the amount of HIV in your body.
  • With proper adherence, ART can reduce HIV to such low levels that the virus can no longer be detected in normal blood tests. This is called having an undetectable viral load.
  • People with undetectable viral loads cant pass HIV on through sex.
  • To know that youre undetectable, you must have your viral load monitored regularly.
  • Remember your viral load can change. If you stop taking your treatment properly your viral load will go up again.

How Is The Hair Follicle Test Performed

The hair follicle test can be performed in a hospital or a lab setting. It is usually ordered as a part of the hiring process or anytime during your employment. There are at-home testing kits that are available without a prescription.

The lab technician will cut about 100 hair samples from the crown of the head. Collecting hair samples from different spots of your hair will prevent giving you a bald spot. The hair will be placed in a hair foil, which will be placed in a closed envelope.

Before the testing, the collected hair is washed and then analyzed for drugs. You do not have to wash your hair or worry about not having to dye your hair before the test.

Hair follicle testing uses two kinds of testing methods.

  • Enzyme-linked immunoassay , which gives preliminary results in 24 hours
  • Gas chromatography/mass spectrometry , which confirms the results
  • You can always ask to retest if you think your test results are inaccurate.

    Many insurance companies cover the expenses of the test if the test is performed in a hospital setting. If performed by your office, the expenses are paid by your employer.

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    S To Take After Being Exposed To Hiv

    Anyone who thinks they may have been exposed to HIV should get tested. If the initial test results are negative, schedule a follow-up test.

    Ask a healthcare provider or contact the local department of public health to find out where to go for testing. Testing sites may offer either anonymous or confidential testing, depending on the laws in the state and local area. Anonymous means names are not recorded by the testing site, and only the person being tested has access to the results. Confidential means a healthcare provider has access to the results, and the results may be recorded in a persons medical file at the testing site.

    Talk to a healthcare provider about post-exposure prophylaxis and pre-exposure prophylaxis.

    Peoples actions can help stop the spread of the virus. Until someone is confident that theyre HIV-free, they should avoid sexual contact or use a condom during sex. Its also important to avoid sharing needles with others.

    To find a nearby HIV testing site, visit

    Do I Still Need To Use Condoms If Im Undetectable

    How Do I Know My HIV Status Instantly?

    Some couples decide that they want to stop using condoms once they or their partner are undetectable. Its important to remember that although theres no HIV risk, being undetectable doesnt prevent you from getting or passing on other sexually transmitted infections or stop unwanted pregnancies, so you will have to use other measures to avoid these.

    If you do stop using condoms, its important that both you and your partner are comfortable with the decision. It can help to talk it through with a healthcare worker first. Its recommended that you have a least two viral load tests confirming that youre undetectable before relying on this for HIV prevention. If your partner is HIV-negative they may consider using PrEP as an extra precaution.

    In couples where both partners are living with HIV, its important that you are both undetectable before deciding not to use condoms. This is because if one partner has a different strain of HIV or has developed drug resistance this can be passed on if they have a detectable viral load.

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    How Long Do I Need To Wait Before I Test

    Thereâs a window period between exposure to HIV and a positive test because it takes time for your body to either build a response to the infection or for the virus to replicate enough for a test to detect it. HIV window periods can vary.

    For example, if you have unprotected sex on a Friday night, and get an HIV test Monday morning, the test wonât be able to detect HIV or an immune response to HIV yet. There hasnât been enough time for a positive result, even if the virus is in your body.

    To get the earliest, most accurate result, first consider when you were exposed and whether youâre showing symptoms.

    • If you know exactly when you may have come into contact with the virus, take a test 3 months after that date. Tests 3 months after exposure should be 99% accurate.
    • If you are having symptoms of HIV, see your doctor right away. Your doctor may want to use a test that can look for the virus directly in your body.

    How Do You Get Hiv

    HIV infection can occur in the following ways:

    • Unprotected sexual intercourse, especially receptive anal intercourse
    • Multiple sexual partners
    • Sexually transmitted diseases: Chlamydia and gonorrhea infections increase the HIV transmission risk by three times syphilis raises the transmission risk by seven times and genital herpes raises the infection risk by 25 times during an outbreak
    • Sharing IV needles or injections
    • Receiving HIV infected blood products
    • Needle-stick injuries
    • Maternal HIV infection : The risk of transmission can be reduced at birth by practices like cesarean delivery and prenatal antiretroviral therapy in the mother, and antiretroviral therapy in the newborn immediately after birth

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    How Long Are The Window Periods Of Different Hiv Tests

    It is hard to say exactly how long the window period lasts, as there are variations between individuals and it is a difficult topic to research .

    Nonetheless, a study by Dr Kevin Delaney and colleagues calculated window periods for a range of HIV testing assays. All these analyses were based on plasma samples. Window periods are likely to be several days longer when testing samples of fingerprick blood or of oral fluid, as will be normal when using rapid, point-of-care tests and self-testing devices. Unfortunately, precise figures for how much longer the window periods are have not yet been published.

    The researchers analysis confirms that fourth-generation laboratory tests detect HIV infections between one and three weeks earlier than older antibody-only tests. Moreover, their data suggest that some countries guidelines which recommend retesting 90 days after a possible exposure to HIV are more cautious than they need to be.

    Afourth-generation laboratory testis recommended in UK and US guidelines. It uses a sample of blood plasma or serum and can detect immunoglobulin G antibodies, immunoglobulin M antibodies and p24 viral antigen . Commonly used tests of this type include Abbott Architect HIV Ag/Ab, GS Combo Ag/Ab EIA and Siemens Combo HIV Ag-Ab.

    • The median window period is 18 days . This indicates that half of all infections would be detected between 13 and 24 days after exposure.
    • 99% of HIV-infected individuals would be detectable within 44 days of exposure.

    Asymptomatic Stds Are Common

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    It’s essential to keep in mind, though, that symptoms aren’t always a good measure of determining whether you or your partner have an STD. Many sexually transmitted diseases can remain asymptomatic for years. In other words, there are no noticeable signs of infection.

    Furthermore, someone can have no STD symptoms at all and still be contagious. Examples of asymptomatic contagious STDs include:

    • Gonorrhea

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    S For Removal And Inactivation Of The Infectious Agent

    The production and purification of individual proteins from plasma is not sufficient to completely rem ove HIV. Therefore additional validated procedures for an effective depletion and inactivation of viruses must be applied . No transmissions of HIV by plasma derivatives have been reported since the consistent implementation of effective methods for removing and inactivating viruses in the production process. Accordingly, the experimentally determined inactivation capacity of the manufacturing process is supported by epidemiologic data.

    HIV is sensitive to heat and detergents . HIV can be inactivated by the solvent-detergent technique, with reagents such as tri-n-butyl phosphate and Triton X-100 or polysorbate 80 . Pasteurisation at 60 °C for 10 h reliably inactivates HIV even in the presence of stabilisers . Heat treatment of lyophilized products inactivates HIV, provided there is appropriate residual moisture of about 1% .

    Because of the heat sensitivity of plasma proteins the inactivation procedures must be carried out under appropriate validated conditions . The product should optimally maintain its biologic activity and native conformation, while potentially contaminating viruses should be inactivated under the production conditions . Treatment with -propiolactone and UV light is effective when applied at low protein concentrations, but not in plasma . The transmission of HIV by PCC preparations was not prevented by treatment with -propiolactone .

    Should I Wait To Test For Hiv

    If you have had unprotected sex, shared injecting equipment or think that you have been at risk some other way, then you should talk to your doctor or a healthcare professional as soon as possible.

    They will be able to talk to you about your situation and help you decide what to do next. If you visit a healthcare professional within 72 hours of when you think you were exposed to HIV, you may be offered PEP . This is a course of emergency HIV treatment that can prevent HIV infection. It must be started within 72 hours and be taken properly.

    Unfortunately, PEP isnt always available and healthcare providers may only give it to you if they feel youre at a high risk of HIV. If you take PEP youll need to test before and after to ensure it has worked.

    If the time to take PEP has passed, then most modern HIV tests are now able to detect HIV from around four weeks after exposure. Depending on the type of test you are offered and when your risk was, your doctor may ask you to come back for further tests and a follow-up to check your results.

    If you think you have been exposed to HIV, it is in this early stage of infection that you are most likely to pass HIV on to others. Be extra careful during this time use condoms and dont share injecting equipment.

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    How Long Does It Take To See The Signs Of Hiv

    The signs and symptoms of HIV may first appear within two to four weeks of infection. The stage in which the symptoms appear is called the stage of acute HIV infection. The symptoms appear due to the resistance or fight of the immune system against HIV. In the initial stage, the virus multiplies rapidly and spreads throughout the body. It targets and destroys the CD4 cells . As a result, the level of HIV in the blood and the chances of transmission at this stage are very high. It is crucial to recognize the early signs and seek medical help, since early diagnosis and treatment of HIV gets the best results.

    How Long Does Seroconversion Take

    #TomorrowsDiscoveries: Detecting HIV prior to symptomsâDr. Gabe Kelen

    The timeframe between when a person contracts HIV and when tests can detect the infection is known as the window period. Everyones immune system is different. This makes it difficult to predict how long this stage will last.

    Scientists have developed sensitive blood tests since the early days of the HIV epidemic. Its now possible to detect HIV antibodies, as well as other components of HIV, earlier than ever before. According to the Johns Hopkins Bloomberg School of Public Health, most people test positive within a few weeks of contracting HIV. For others, it may take

    During the window period, a person may develop symptoms similar to the flu or other common viruses that include:

    • swollen lymph nodes
    • rash
    • fever

    Symptoms may last from a few days to a few weeks. And they may range from mild to severe. But its possible to pass through the early infection stage without experiencing any symptoms at all. During this time, a person may not even realize that theyve contracted HIV.

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