Why Is Percutaneous Umbilical Blood Sampling Done?
Percutaneous umbilical blood sampling usually is done in addition to an ultrasound
and amniocentesis if a health care provider:
needs to quickly check a baby's chromosomes for defects or disorders
is concerned that the baby may have another problem, such as a low platelet count
or a thyroid condition
The advantage to PUBS is its speed. If the fetus might be anemic
or have a platelet disorder, this test is the only way to confirm it because it uses
a blood sample rather than an amniotic fluid sample. It also allows transfusion of
blood or needed fluids into the baby while the needle is in place.
Should I Have Percutaneous Umbilical Blood Sampling?
Your health care provider may recommend this test if:
Risks are associated with PUBS, such as miscarriage
or infection. Discuss the risks and benefits with your health care provider if you
choose to have this test.
What Happens During a Percutaneous Umbilical Blood Sampling?
This test takes a fetal blood sample by guiding a needle into the umbilical cord.
A fine needle is passed through the abdomen and uterus into the umbilical cord, then
the blood is withdrawn for testing.
When Are Percutaneous Umbilical Blood Samplings Done?
Percutaneous umbilical blood sampling usually is done after the 18th week