Three most accurate times for prenatal screening?

15/01/2025

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  1. First Trimester Prenatal Screening (11th- 13th Week)
    • This is a crucial stage to detect genetic abnormalities at the earliest. Common screening methods include:
    • Ultrasound: Evaluates the structure of the fetus, particularly measuring the nuchal translucency to detect the risk of heart defects or genetic syndromes.
    • Blood tests (Double test, NIPT): Identifies congenital abnormalities with high accuracy (up to over 99%).
    • Risk assessment for infections from viruses and bacteria during early pregnancy, such as CMV, Toxoplasma, etc.
  2. Second trimester Prenatal Screening (16th – 18th Week)
    • This is the ideal time to detect structural and organ abnormalities in the fetus. Methods include:
    • Ultrasound: Assesses the structure of important organs of the fetus, such as the brain, heart, kidneys, etc.
    • Triple test: A blood test that helps identify congenital abnormalities, with up to 90% accuracy.
  3. Third Pregnancy Prenatal Screening (Weeks 22 – 26)
    • This stage focuses on testing for bacteria and viruses in the vagina to ensure a safe and smooth delivery. It is the final step to ensure the health of both mother and baby before birth.

Prenatal screening is an important step in maternal and fetal healthcare. Screening at these “golden” time points not only helps detect abnormalities early but also increases the chance of a healthy baby, minimizing risks for both mother and baby. Therefore, pregnant women should follow the recommended prenatal check-up schedule and perform screenings at the right time to ensure the best health for both mother and baby.


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