Can I still undergo non-invasive prenatal testing at 31 weeks of pregnancy?

Non-invasive usually refers to non-invasive DNA testing, which is a means of prenatal examination to rule out fetal development abnormalities. Non-invasive DNA testing is generally not recommended after 31 weeks of pregnancy, but other tests can be conducted to determine whether the fetal chromosomes are abnormal. Non-invasive DNA testing involves drawing the pregnant woman's venous blood and analyzing certain components to assess the possibility of fetal chromosomal abnormalities. The optimal gestational age for non-invasive DNA testing is between 12 and 23 weeks, and it is generally not recommended after 23 weeks. If non-invasive DNA testing is performed at 31 weeks of pregnancy, the accuracy of the results may be compromised, necessitating the use of other more precise tests as an alternative. If other prenatal examination results indicate potential issues, and it is necessary to determine whether the fetus has chromosomal abnormalities, amniocentesis or fetal umbilical blood puncture can be performed to directly collect fetal exfoliated cells or blood for examination. Although these tests may cause some discomfort, they generally do not induce premature birth and offer significantly higher accuracy than non-invasive DNA testing. Pregnant women should follow medical advice and undergo the appropriate tests to avoid missing the optimal timing for examination.