(IgG klasės antikūnai prieš Herpes simplex 6 (HSV6 IgG))

The IgG antibody test for Herpes simplex 6 (HSV6 IgG) is a serological test used to detect immunoglobulin G (IgG) antibodies against human herpesvirus 6 (HHV‑6), also known as Herpes simplex 6 (HSV6), in the blood. The presence of these antibodies indicates prior exposure to the virus and the body’s immune response to a past infection.

What are HSV6 and IgG antibodies?

Human herpesvirus 6 (HHV‑6) is a virus belonging to the herpesvirus family. It is very common and most often causes roseola (sixth disease) in infants and young children. Roseola is characterized by a high fever followed by a pink rash. After the primary infection, the virus remains in the body for life in an inactive form and may occasionally reactivate.

HHV‑6 has also been associated with other conditions such as encephalitis, hepatitis, and bone marrow suppression, particularly in individuals with weakened immune systems.

When the body encounters HHV‑6, the immune system produces antibodies. IgG antibodies are long-term antibodies that develop after infection and can remain in the blood for a long period, indicating past infection and immunity.

Why is the HSV6 IgG test performed?

This test is usually performed to:

• Determine past HSV6 infection: when there are unclear symptoms that may be related to HSV6 infection (e.g., fever, rash, neurological symptoms).
• Assess immunity to HSV6: especially in immunocompromised individuals, before organ transplantation, or in pregnant women.
• Differentiate from other diseases: when symptoms resemble those of other viral infections.
• Investigate fever or rash of unknown origin: particularly in infants and young children.

It is important to note that the presence of IgG antibodies indicates a past infection and does not confirm an active, current infection. Active infection is usually diagnosed using IgM antibody testing or detection of viral DNA.

Test procedure in a clinic

The HSV6 IgG test is a simple blood test. A blood sample is taken from a vein, usually in the arm. Typically, no special preparation, such as fasting, is required, but it is always recommended to consult a doctor for specific instructions.

Interpretation of results

HSV6 IgG test results are interpreted based on established reference ranges, the patient’s symptoms, medical history, and other diagnostic data:

• Positive result: indicates that the individual has previously been infected with HSV6 and has developed an immune response.
• Negative result: indicates that the individual has not been exposed to HSV6.