The Rh test is a blood test. It checks
your blood for a marker called Rh. If you have Rh-negative blood and your baby
has Rh-positive blood, your immune system may make antibodies that can harm
your baby. When a pregnant woman has these antibodies, it is called Rh
The Rh test is done in early
pregnancy to find out if your baby is at risk for Rh disease. This can happen
if you have Rh-negative blood and your baby has Rh-positive blood. If your
Rh-negative blood mixes with Rh-positive blood, your immune system will make
antibodies to attack the Rh-positive blood.
these antibodies could attach to the baby's red blood cells. This can cause
your baby to have serious health problems.
You do not need to
do anything before you have this test.
A health professional takes a sample of your blood.
sensitization does not cause any warning symptoms. A blood test is the only way
to know if you are at risk for it.
Watch closely for
changes in your health, and be sure to contact your doctor, midwife, or nurse call line if you have any
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and
call your doctor, midwife, or nurse call line if you are having problems. It's also a good idea to keep a
list of the medicines you take. Ask your doctor or midwife when you can expect to have
your test results.
Go to https://www.healthwise.net/patientEd
Enter P722 in the search box to learn more about "Rh Antibodies Screening: About This Test."
Current as of:
May 30, 2016
Adam Husney, MD - Family Medicine
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