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The Parvovirus B19 IgG antibody test detects past infection or immunity to Parvovirus B19, the virus responsible for erythema infectiosum (Fifth disease) and complications like anemia and fetal risks during pregnancy.
✅ Determine past infection or immunity to Parvovirus B19
✅ Assess immunity in pregnant women exposed to Parvovirus B19
✅ Differentiate between past and recent infection (when combined with IgM test)
✅ Evaluate individuals with unexplained anemia, joint pain, or immune disorders
| Test Result | Interpretation |
|---|---|
| Positive | Past infection or lifelong immunity |
| Negative | No prior infection, susceptible to future infection |
📌 IgG antibodies appear about 10–14 days after infection and usually persist for life, providing immunity.
| Test | Indicates | Timing |
|---|---|---|
| IgM Positive | Recent/active infection | Appears 7–10 days after infection, lasts 2–3 months |
| IgG Positive, IgM Negative | Past infection, immunity | Lifelong protection |
| IgG Negative, IgM Negative | No prior infection | Susceptible to infection |
✔ If IgG is Positive: The person is immune, and there is no risk to the fetus.
❌ If IgG is Negative: The person is at risk of infection, and precautions should be taken if exposed.
📌 Infection during pregnancy (especially in the first half) can cause fetal complications like hydrops fetalis due to severe anemia.
🔬 If IgG is Positive:
✔ No further testing needed unless symptoms of active infection appear.
🔬 If IgG is Negative & Exposure Suspected:
✔ Consider IgM testing to check for a recent infection.
✔ Repeat testing in 2-4 weeks if symptoms develop.
✔ If pregnant, fetal ultrasound may be recommended to monitor for complications.