Contraction stress test in pregnancy
Who gets the test?
Some women who experience
complications during pregnancy require a contraction stress test, although this
test is much less common than it used to be. More often you will take a
non-stress test or a biophysical profile. If these results indicate a possible
problem, your doctor may suggest a contraction stress test as a follow-up.
Labor stress tests are very
rarely done in women with twins because they can induce early labor.
What does the test do
The contraction stress test
helps predict how your baby will behave during labor. The test causes
contractions and records the response of your baby's heart. A normal heartbeat
is a good sign that your baby will be healthy during delivery.
How the test works
You will lie down with two
straps around your stomach. One measures your child's heart rate and the other
measures contractions. To induce contractions, your doctor may give you a dose
of oxytocin intravenously in your arm. Or the doctor may suggest rubbing the
nipples through clothing, which can cause contractions. You then wait while the
monitors record your baby's contractions and heart rate. The test takes about 2
hours. Contractions can be uncomfortable.
The contraction stress test is
usually safe, but sometimes it causes early labor. The test is more dangerous
for women with placenta previa, an increased risk of uterine rupture, or women
who have previously had a caesarean section. Your doctor will help you weigh the
benefits and risks before the test.
What you need to know about test results
If your baby's heart rate
drops during labor, it could be a sign of problems. Your doctor may suggest
other tests. Sometimes early delivery is the best option.
If your child's heartbeat
remains normal during the test, that's a great sign. However, your doctor may
suggest that you repeat the test later if the results of other tests indicate a
possible problem.
A contraction stress test is
more effective at ruling out problems than at diagnosing them. Many women with
abnormal results give birth to perfectly healthy babies.
How often is a test done during pregnancy?
Women can have a contraction stress test at 32 weeks or later. Until then, the test may not be sure. How many times you need the test depends on your situation. Ask your doctor.