With this test, the responses of the fetus to the
contractions created in the mother's womb are evaluated. With the contractions
created in the uterus, the pains that will occur during birth are tried to be
imitated. It is done in the weeks close to birth, not in the early weeks
because the pain caused by it can cause preterm labor. In cases where NST is
suspected of distress in the nonreactive fetus, the fetus is re-evaluated with
the OCT test.
To create contractions in the mother's womb, oxytocin hormone
(artificial pain) is given in the serum, or contractions can be created by
stimulating the nipple. NST device (cardiotocograph) is attached to the
mother's abdomen and the contractions that occur on the paper and the responses
of the baby's heartbeat are monitored. OCT test is positive if the baby's
heartbeat slows down in at least half of these contractions after effective
contractions have occurred, that is, 3 times in 10 minutes. In this case, it is
often thought that the fetus will respond to the contractions that will occur
during normal delivery in the same way, that is, the heart rate will slow down,
and therefore a cesarean is decided. If the fetal heartbeat does not slow down
despite the contractions occurring during the test, OCT is considered negative,
indicating that the fetus is not in trouble, it is in good condition in the
uterus.
Fetal mortality rate is less than 0.1% within one week
following a negative CST. In one study, it was stated that there was only one
death in 1337 risky pregnancies.
CST cannot
be done if:
- Patients who have undergone classical cesarean or
myomectomy surgery
- Placenta previa
- Placental detachment
- Preterm birth threat
- Multiple pregnancy
- Those with cervical insufficiency
CST
Assessment - Summary:
Nonreactive: No acceleration (acceleration of the fetus's
heartbeat) during the test
Reactive: Monitoring acceleration during the test
Negative: No late dilation (although at least 3 contractions
in 10 minutes)
Positive: Significant permanent and recurrent late
decelerations in more than half of the contractions
Doubtful: Non-permanent and non-repeated late decelerations
Hyperstimulation: late deceleration in the presence of
contractions lasting more than 5 and more than 90 seconds in 10 minutes
Inadequate: Uterus contractions not achieved during testing
- FETAL NUCHAL THICKNESS MEASUREMENT
- NUCHAL TRANSLUCENCY SCAN TEST
- TRIPLE SCAN TEST
- WHAT IS QUADRUPLE BLOOD SCREENİNG TEST?
- INTEGRATED TEST
AMINOSYNTHESIS
CHORİONİC VİLLUS SAMPLİNG (CVS)
CONTRACTION STRESS TEST (CST)
fethal nuchal thickness test
GLUCOSE SCREENİNG TEST
INTEGRATED TEST
NST (NONSTRES TEST)
QUADRUPLE BLOOD SCREENİNG
