PUBS is also known as Percutaneous Umbilical Blood Sampling which examines fetal blood directly from the umbilical cord and uses that sample to detect the disorder. This method is used to detect many kinds of genetic disorders that the unborn child might have, and can also tell about certain blood conditions or infections but, even so, other tests like CVS & Amniocentesis DNA Tests are preferred over this test.

In PUBS the sample is obtained by use of an ultrasound. The doctor uses ultrasound to detect the umbilical cord and then with the guidance of the ultrasound inserts a needle through the abdomen and uterus into the umbilical cord to obtain the blood sample of the fetus as the DNA from which the umbilical cord is made of is identical to the child’s DNA.

In amniocentesis, the sample is obtained by inserting a thin needle through the abdomen into the amniotic fluid of the fetus, and then that sample of amniotic fluid is used for DNA testing.

In CVS the sample is obtained by inserting a thin needle through the cervix a tissue of chorionic villi is removed from the placenta and then the sample is used for DNA testing.

Although all of the above methods contain their fair share of risk, even then amniocentesis and CVS is preferred over PUBS because of the more severe risk related to it like:

• Infection
• Preterm also called premature rupture of membrane
• There might be some cases where emergency cesarean was performed for delivery
• T can also cause fetal demise
• Fetal bleeding
• Change in the heart rate of the baby

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