Determinants of male or female birth, Hong Kong maternal DNA blood test to identify gender

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How many weeks to go to Hong Kong to detect fetal gender/Hong Kong blood test to check gender
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Zhou Maternal Blood Collection
Test
The test for fetal gender is quite mature in Hong Kong
and the cost
is also relatively cheap. Moreover, because of its high accuracy, the only non-invasive testing method is weekly blood testing to determine fetal gender. It does no harm to the baby or the mother, and is currently the most popular identification method!
So what is the principle of this kind of maternal gender identification?
After the blood samples of pregnant women are extracted, they are first processed by high-speed centrifugation twice, and the supernatant in the upper layer is moved into a new sterile tube and frozen for later use. Then use reagents to extract the supernatant, dye it, and observe it under a UV lamp. If you see a band, it means it's a boy; if it doesn't, it means it's a girl.