How is non-invasive DNA testing performed?
Oct 27, 2023
Source: Cainiu Health
Dr. Zhao Xiaodong
Introduction
Non-invasive DNA testing is a common prenatal screening method that can help rule out fetal developmental abnormalities. This test is suitable between 12 and 20 weeks of pregnancy. Fasting is not required for the test, but it is advisable to avoid spicy and stimulating foods, and to refrain from staying up late the night before the test. If you wish to undergo non-invasive DNA testing, it is recommended to visit a正规 hospital.
In general, non-invasive DNA testing is a common prenatal screening method that can help rule out fetal developmental abnormalities. The specific procedure is as follows:
1. Have the pregnant woman sit down and roll up her sleeve to expose her arm.
2. Apply a tourniquet about 10 cm above the elbow, and disinfect the forearm twice with povidone-iodine.
3. Insert the blood collection needle into the superficial vein at the disinfected site and draw 5–10 mL of venous blood.
4. Use next-generation DNA sequencing technology to extract and analyze DNA fragments from the blood sample.
Non-invasive DNA testing is best performed between 12 and 20 weeks of pregnancy. Fasting is not required for the test, but it is advisable to avoid spicy or stimulating foods, and to avoid staying up late the night before the test. If you wish to undergo non-invasive DNA testing, it is recommended to visit a reputable hospital.
