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.

Yes.
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.