Amniocentesis has a
very small risk of causing bleeding that could lead to mixing your blood and
your fetus's blood. So if you have Rh-negative blood, you will be given the
Rh immunoglobulin vaccine (such as RhoGAM) to prevent Rh sensitization, which
could harm your fetus if he or she has Rh-positive blood.
After the test
After the test, you may have some
mild cramping. You should not do any strenuous activity for several hours after
the test. Also, do not douche, use tampons, or have sex after the test. By the
next day, you can do your normal activities, unless your doctor tells you not
Call your doctor right away if:
- You have moderate or severe belly pain or
- You develop a fever.
- You become
- Fluid or blood leaks from your vagina or from the needle
- Redness or swelling develops at the needle site.
Amniocentesis is a test to look at the
fluid (amniotic fluid) that surrounds your
Normal amniotic fluid is
clear to light yellow in color and does not contain any harmful bacteria. The
cells can be tested for problems.
- Cells from your fetus are looked at carefully
for the proper number and arrangement of the cell parts (chromosomes) that show genetic disease. Normally there
are 46 chromosomes in each cell, arranged in 23 pairs. Chromosomes also tell
the gender of your fetus.
- The amounts of some substances in the
amniotic fluid may be measured. These results can find some birth defects,
genetic diseases, and the maturity of your fetus.
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- If there is blood from your fetus in the amniotic fluid. This can
falsely increase the level of the substances alpha-fetoprotein (AFP) and
acetylcholinesterase (AChE) levels, which test for
neural tube defects.
- If the amniotic fluid
is exposed to light. This can falsely lower bilirubin levels.
there is blood or meconium in the fluid. This may cause an incorrect result for
the test that checks to see whether your baby's (fetus's) lungs are