Obstetric Ultrasound 3D and 4D

We perform 5 ultrasound scans during the pregnancy:

• 7-8 weeks ultrasound:
  • Identify the fetal heart beat.
  • Number of fetus and chorionicity.
  • Accurate gestational age.
  • Location of pregnancy, intra or extra uterus (diagnosis of ectopic pregnancy).
• 12 weeks ultrasound:
  • To confirm exact gestational age and viability.
  • Nuchal translucency measurement and other secondary markers of chromosomal defects (nasal bone, ductus venosus and tricuspid regurgitation).
  • Early diagnosis of major anomalies in the fetus and confirmation of multiple pregnancies. Diagnosis, too, of the twin pregnancies chorionicity.
  • Doppler of the uterine arteries to evaluate the flux so if there is a high resistance in the first trimester there is a higher risk of pre-eclampsia or intrauterine growth retardation in the early pregnancy (less than 34 weeks). There is some evidence that the administration of AAS in low dose before 16 weeks of pregnancy and up to 32 weeks could reduce the risk of these pathologies up to a 50%.
• 20 weeks ultrasound:
  • High resolution ultrasound scan where we look at the anatomy of the fetus in order to discover any anatomical defects.
  • Evaluate ultrasound secondary markers of chromosomal defects.

• Analyze placental side and umbilical cord location.
• Evaluate amniotic fluid volume.

• 29 weeks ultrasound:
  • Rate proper growth of the fetus and fetal static.
  • Doppler study to evaluate fetal hemodynamic responses.
  • Characteristics and location of the placenta.
  • Calculate the volume of amniotic fluid.
• 36 weeks ultrasound:
  • Rate proper growth of the fetus and fetal static.
  • Doppler study to evaluate fetal hemodynamic responses.
  • Characteristics and location of the placenta.
  • Calculate the volume of amniotic fluid.

Optionally, you can perform the following scans:

• 25 weeks: transvaginal ultrasound scan to evaluate the cervical length. It is a marker of preterm labor and it allows us to treat it so to decrease the risk. We also evaluate fetal growth with an abdominal ultrasound scan.
• 27-29 weeks: 4D ultrasound scan it’s not a diagnosis scan but it allows to see the fetus in real time and to see its movements inside the uterus. We record it in DVD.

The High risk pregnancy, such as multiple pregnancy, will have as many ultrasound scans as considered necessary by the doctor.