Oxytocin challenge test (OCT) is to use oxytocin in pregnant women, induce contractions, observe changes in fetal heart rate in the case of contractions, and thus understand the function of the placenta, determine whether the reserve capacity of the fetus is good or not. it is good.

Basic Information

Specialist classification: maternity inspection inspection classification: other inspection

Applicable gender: whether women are fasting: not fasting

Analysis results:

Below normal:

Normal value:
no

Above normal:

negative:
The test results were negative, the fetal heart rate baseline variability was normal, or fetal heart rate accelerated after fetal movement; 3 times of contractions every 10 minutes, sustained ≥ 40, no late deceleration occurred.

Positive:
The test results were positive. OCT positive refers to the use of uterine contractions to induce contractions in pregnant women. If the posterior deceleration is repeated after contractions, the baseline rate of fetal heart rate is reduced, and the fetal heart rate is not accelerated after fetal movement.

Tips: Relax your body and actively cooperate with your doctor. Normal value

The test results were negative, the fetal heart rate baseline variability was normal, or the fetal heart rate accelerated after fetal movement; there were 3 uterine contractions every 10 minutes, lasting ≥ 40, no late deceleration occurred.

Clinical significance

Abnormal results:

The test results were positive. OCT positive refers to the use of uterine contractions to induce contractions in pregnant women. If the posterior deceleration is repeated after contractions, the baseline rate of fetal heart rate is reduced, and the fetal heart rate is not accelerated after fetal movement. OCT abnormalities suggest that the placental function has subsided, and the fetus is in a state of hypoxia in the uterus. The doctor needs to take certain measures to let the pregnant woman give birth as soon as possible, so that the fetus can be separated from the bad environment of the mother's uterus as soon as possible to ensure the safety of the fetus.

People who need to be examined: may have low placental function (such as high-risk pregnancy, IUGR), NST non-responsive pregnant women.

Positive results may be diseases: fetal distress, abdominal pregnancy precautions

Before the inspection: calm down the mood.

When checking: Relax your body and actively cooperate with your doctor.

Inspection process

1. Same as No. 1 to 5 of the no-load test.

2. This test is performed when there is no reaction in the no-load test twice.

3. Fix the fetal heart probe to the loudest part of the fetal heart. The contraction pressure probe is fixed at the lower horizontal finger of the palace and the monitor is started.

4, oxytocin 2.5u dissolved in 5% glucose 500ml, intravenous drip, dose from 0.5μm / min (about 5 drops / min), if can not stimulate the uterus contraction, increase 5 drops every 10min-15min, There were 3 contractions until 10 minutes. The maximum dose should not exceed 20 μm/min.

5, when intravenous oxytocin, synchronous monitoring of fetal heart rate, uterine contraction and fetal movement, continuous observation 3 times -10 times contractions.

Not suitable for the crowd

Inappropriate people: placenta previa or unexplained prenatal bleeding, previous cesarean section or other causes of scar uterus, multiple pregnancy, polyhydramnios or too little, threatened premature delivery and cervical relaxation, suspected fetus There have been severe intrauterine distress.

Adverse reactions and risks

Nothing.