Ultrasonography in Pregnancy

  • Sonography also known as USG or Sonogram is an imaging test offered during pregnancy for viewing developing foetus.
  • It uses sound waves to create images of structures within and so is very safe in pregnanacy.
  • It does not use radiation.

Sonography will confirm that pregnancy has reached inside the uterus.(rules out ectopic pregnancy). We can also get an idea about number of fetuses (eg.Twins)

Yes,you should.

  • It called as Dating Scan.
  •  It helps to fix E.D.D. (Expected date of delivery)
  • It can also pick up foetal heart activity.

It is a sonography test offered at 11 to 14 weeks of pregnancy to check

a)  Growth and development in first three months

 b) Uterine artery PI(For early prediction of pregnancy induced Hypertension/BP)

c) It also tells you about the probability of your baby having genetic abnormality( especially chromosomes number 13,18,21) It is not a definitive test but only categorises you as Low Risk or High Risk.

 When combined with a blood test called Double Markers, the accuracy of the categorization increases to 90% to 95%

 If combined results of these two tests come as high risk then Amniocentesis is advised for confirmation.

  • Anomaly scan is done at 18-24 weeks of pregnancy.
  • It is a detailed evaluation of different parts of baby's body to know any developmental defects.
  • The scan also entails measurements of different parts of the body to know growth of the baby till now.
  • It also documents the fluid level, location of placenta, cervical length and uterine atery PI.
  • It has its own limitations.(as 30% of defects can be mivssed.)
  • This is commonly known as Interval Growth Scan.
  • It will check growth of the baby and will comment if it is corresponding to gestational age.
  • It is usually combined with Doppler study(colour snography) to know blood supply from mother to baby and in the baby's body.
  • It tells you about baby’s expected weight, amount of liquor and problems regarding placenta.
  • 3D/4D as name suggests,probvides you. 3D/4D images of the baby.
  • It is mostly used for better understanding of any problems/anomalies if detected on 2D USG.