Borrelia burgdorferi p30 - IgM

What Does a Positive or Elevated IgM Result for p30 Mean?

A positive or elevated IgM response to the p30 antigen may suggest:

• Recent exposure to Borrelia burgdorferi (early-stage Lyme disease)

• An active immune response to a new or recent infection

• Possible false-positive result due to cross-reactivity with other bacteria or immune conditions

This marker is typically used in combination with others—like p41, VlsE1, or p23—to improve diagnostic accuracy. Alone, a positive p30 – IgM result is not sufficient to confirm Lyme disease.

Next Steps

• Consult your healthcare provider. They can assess this result in the context of your symptoms and history.

• Follow-up testing may be recommended, including IgG antibodies or PCR to detect bacterial DNA.

• If Lyme disease is suspected, early treatment with antibiotics is often effective and can prevent complications.

Summary

The Borrelia burgdorferi p30 – IgM marker is used to help identify early Lyme disease by detecting immune activity against a specific bacterial protein. A medium or positive result suggests potential recent exposure but should always be evaluated alongside clinical symptoms and additional test results to confirm a diagnosis.

What is Borrelia burgdorferi p30 – IgM?

The p30 – IgM marker measures early immune system activity against the p30 protein of Borrelia burgdorferi, the bacterium responsible for Lyme disease. The "p30" refers to a 30-kilodalton protein expressed by the bacterium, which serves as one of several antigens used in serologic testing to detect the body’s immune response.

IgM antibodies are produced during the early stages of infection—typically within the first 1 to 2 weeks following exposure. Therefore, the presence of IgM antibodies to the p30 protein may indicate that your immune system is actively responding to a recent or ongoing Borrelia infection.

What Does a Medium Result Mean?

A medium result for Borrelia burgdorferi p30 – IgM indicates a moderate level of IgM antibodies to the p30 protein. This may represent an early immune response, a waning infection, or a nonspecific antibody reaction. While not strongly positive, it suggests some level of immune activity and should be interpreted alongside your symptoms, exposure risk (such as tick bites in a Lyme-endemic area), and results from other Lyme-related markers.