False positive results can occur with many diagnostic tests, including STD tests. The chances of false positive results increase as the likelihood of the infection decreases in the person being tested. False positive HSV-2 results can happen, especially in people who are at low risk for a herpes infection.
How common are false positive HSV-2 tests?
HSV-2 isn’t included in the standard panel of tests for sexually transmitted infections. The widely available tests for herpes are famously inaccurate and can give false positives up to 50%. In some cases they can fail to detect the virus at all.
What can cause a false positive HSV-2 IgG test?
A person who only has HSV-1 may receive a false positive for HSV-2. IgM tests sometimes cross-react with other viruses in the same family, such as varicella zoster virus (VZV) which causes chickenpox or cytomegalovirus (CMV) which causes mono, meaning that positive results may be misleading.
How accurate is the HSV-2 antibody test?
Type-specific glycoprotein G-based serologic tests are designed to detect whether there are any antibodies to the herpes virus in the blood. Blood tests have a sensitivity of about 80-98% for HSV-2.
How long does HSV-2 IgM stay positive?
The time required for the development of IgG antibodies following HSV infection varies from 21 to over 42 days with most individuals having detectable IgG 21–28 days after exposure to the infection and probably lasting for life.7–,9 IgM antibodies are usually detectable 9–10 days after exposure and last 7–14 days.
Is HSV PCR accurate?
PCR assays or other NAATs are the most sensitive test currently available to detect HSV in clinical samples. The detection rates of the PCR assays were shown to be 11–71% superior to virus culture [26,41-44].
Does everyone have HSV-2 antibodies?
About 70% of adults have been infected by HSV-1 and have antibodies against the virus. About 20 to 50% of adults will have antibodies against the HSV-2 virus, which causes genital herpes.
How long does HSV IgM stay positive?
Can HSV 2 antibodies disappear?
It may take between six and eight weeks to detect antibodies in a herpes blood test after first becoming infected with HSV. Also, antibodies may disappear with time, especially if the person has infrequent recurrences of herpes.
Can you get a false negative HSV 2 test?
As with all available medical tests, herpes tests can give you false-negative results.
What is a positive HSV 2 result?
Positive/Abnormal. HSV was found in your sample. It may mean you have an active infection (you currently have sores), or were infected in the past (you have no sores). If you tested positive for HSV, talk to your health care provider. While there is no cure for herpes, it hardly ever causes serious health problems.
Are IgM tests for HSV-2 accurate?
According to the American Sexual Health Association (ASHA), IgM tests can lead to deceptive results, as well as false assumptions about how and when a person acquired HSV. And that’s not all: IgM tests fail to accurately distinguish between HSV-1 and HSV-2 antibodies, leading them to provide false-positive results for HSV-2.
When not to test for HSV antibodies?
When it comes to when not to test for HSV antibodies, the CDC and others specifically state that the general population should not be screened for antibodies to HSV, and also, the focus of this Hot Topic, that HSV IgM tests should not be used.
What does a negative herpes IgM blood test result mean?
A negative result means that no IgM was detected. An equivocal test result means that the test was unable to determine whether or not there was an antibody present. Does a Positive Test Mean a New Infection? The common wisdom suggests that a herpes IgM blood test means that someone has been recently infected with herpes.
What is HSV IgG serology and who should have it?
HSV IgG serology is also recommended for individuals presenting for an STD evaluation, and especially in those with multiple sex partners, in those with HIV infection, and in men who have sex with men who are at increased risk for HIV acquisition.
