Scans after 20 weeks

Will I have a scan after 20 weeks?

If there are no complications, you will not need more scans after your anomaly scan (at about 20 weeks).

Your doctor will just keep a track of your baby’s growth by measuring the fundal height- distance from the front of your pelvis to the top of your womb.

To make sure you and your baby is fine, your doctor may ask you to go for following tests, regularly:

  • blood pressure
  • urine test
  • blood samples

However, if you have had any complications in your previous pregnancy or any problems are detected after 20 weeks, then you might be offered extra scans.

Why do I need scans later in pregnancy?

  1. The most common reason for a scan during the third trimester of pregnancy is to check the normal growth of baby (a growth scan). If your doctor (by measuring your bump) gets a feeling that your baby is not growing at expected rate, then she might ask you to go for a growth scan.
  2. One of the reasons for which your doctor may ask you to get a scan is if she thinks you are carrying a baby larger than the average. Or if she suspects that there is too much amniotic fluid around your baby (polyhydramnios).
  3. Regular scans are also be recommended in case of detection of any medical conditions high blood pressure or diabetes, or it may also be recommended if you had any complications in your previous pregnancies.
Other reasons for getting a scan done in second half of your pregnancy:
  • Check the position of placenta.
  • Check whether the placenta is fine or not and normal heart beat of baby (Doppler scan).
  • Monitor twins or triplets.
  • Check the position of your baby.

Things that scan in the third trimester can’t reveal

  1. Whether your due date is correct

Your due date and your stage of pregnancy need to be established before 20 weeks (ideally between 11th and 14th week).

  1. Detect any bleeding

If you bleed during your pregnancy, then a scan can surely detect if your baby is affected by the bleeding or not, but it cannot tell the cause of bleeding (unless it is clearly besides the placenta)

  1. How much your baby weighs

Generally, abdominal circumference, head circumference and femur (thigh bone) length of your baby is measured to assess his growth. However, accurate measurement may not be taken in late pregnancy as your baby’s head might lay too low in your pelvis then.

Is it safe to have several scans?

Ultrasound scans do not possess any side effects and are considered completely safe for mums-to-be and their babies. Even so, your obstetrician will suggest a scan only if there is clear medical reason behind it.

For all pregnancy related information download Pregnancy Health, Diet and Fitness by Ango!