HSV 1 & 2 refer to Herpes Simplex Virus types 1 and 2. HSV-1 typically causes oral herpes, while HSV-2 is more commonly associated with genital herpes.
The IgM test for HSV-1 and HSV-2 is designed to detect IgM antibodies, which are produced by the immune system shortly after an initial infection or during a reactivation of the virus. 

Why the Test is Ordered:
- To detect a recent or reactivated infection with HSV-1 or HSV-2.
- In cases where patients present with symptoms of herpes but have no previous history, or when there's a need to determine if a new infection has occurred.
- In pregnant women, as HSV can be transmitted to the fetus, which can cause complications.

Risks:False Positives/Negatives: IgM tests can sometimes yield false positives or negatives, which can lead to misinterpretation. False positives may occur due to cross-reactivity with other viruses, and false negatives may occur if the test is done too early in the infection.
Timing:The IgM antibodies can appear early in the infection but might not be present later, making it challenging to diagnose a past infection or differentiate between new and old infections.

Normal Result:The test is usually reported as either negative or positive.
  -Negative:No detectable IgM antibodies, suggesting no recent or active infection.
  - Positive:Detectable IgM antibodies, indicating a recent or active infection with HSV-1 or HSV-2.
  

1. Positive Result:
- Recent Infection: A positive IgM result suggests a recent or primary HSV infection.
- Reactivation:It may also indicate reactivation of a previous infection.
- Cross-reactivity:The presence of IgM antibodies might also be due to cross-reactivity with other viruses, leading to a false positive.

2. Negative Result:
- No Recent Infection: A negative result typically suggests no recent infection or that the test was conducted before IgM antibodies could be detected.
- Window Period:If the test is done too early, it might not detect an early infection, leading to a false negative.

The test typically requires a blood sample. The blood is usually drawn from a vein in your arm.