The torch results showed 3 positive for IgG and negative for IgM.

Patient's question:

No

Doctor's answer:

After TORCH infection, patient-specific antibodies IgM and IgG can rise rapidly. IgM appears early and can persist for 6-12 weeks, while IgG appears later but can last a lifetime. Therefore, we often consider IgG positivity as a sign of previous infection, while IgM positivity serves as a diagnostic indicator for primary infection.
1. IgG positive, IgM negative
The patient has previously been infected with this virus or has been vaccinated and has developed immunity. The likelihood of fetal infection is very low.
2. IgG negative, IgM negative
The pregnant woman is susceptible. It is recommended to repeat the IgG test during pregnancy to observe if it turns positive.
3. IgG positive, IgM positive
The pregnant woman may have primary or secondary infection. The IgG affinity test can be used to differentiate.
4. IgG negative, IgM positive
Recent infection or acute infection; it could also be a false positive for IgM caused by other interfering factors. A retest is needed after 2 weeks. If IgG turns positive, it indicates acute infection; otherwise, it is considered a false positive.