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    How To Read Ultrasound Report Of Pregnancy?

    Written on 14 July 2022


    Ultrasonography is a diagnostic procedure done during the three trimesters of pregnancy to assess the baby's growth, the health of the mother's reproductive organs, and the fetus's heart and confirm pregnancy status. An ultrasonography machine utilizes ultrasonic waves to visualize the inside of the womb through a specialized probe and ultrasound gel. Read on to learn about the different types of ultrasound done during pregnancy and how to read an ultrasound report.

    Types of ultrasound in pregnancy

    With the advent of science and technology, ultrasonic scanning of the growing womb has made significant advancements. There are five major types of ultrasound in pregnancy:

    • Transvaginal ultrasound

    ‘Transvaginal’ means through the vagina. This scan is done for a mother-to-be who is facing a high-risk pregnancy or having any critical health concerns. It is generally done when the fetus is below 10 weeks.

    • Standard ultrasound

    In this type of ultrasound, the technician moves a wand-shaped transducer over the stomach to see the 2D figure of your baby in the womb.

    • Fetal echocardiography

    This reading is done to detect any issues or defects in the baby’s heart and if anything suspicious was detected with a standard ultrasound.

    • 3-D ultrasound

    This sonography is done by a unique transducer that produces a complete and more detailed picture of your fetus.

    • Dynamic 3-D ultrasound (4D ultrasound)

    This is similar to 3-D ultrasound. The difference here is that you can see the movement of your baby visually and can also have a video recorded in some cases.

    How to read a pregnancy ultrasound report

    1. Look at your womb

    When you look at your womb in the sonogram, you will see a light gray or white line around the image's corners. Inside these lines, you will see a large black area known as amniotic fluid.

    1. Look at your baby

    Your baby will appear grey or white in the amniotic fluid, i.e., the dark area discussed above.

    • In an ultrasound taken in the first 8 weeks of pregnancy, your fetus will be the size and shape of a baked bean.
    • If you go for a scan at 12 weeks, you will see the head of the baby.
    • At 20 weeks, the difference seen in the scan will be incredible. You will be able to locate the baby’s eyes, spine, heart, and feet. You can also get to know the baby’s sex.

    Are the numbers on the ultrasound picture relevant to you?

    The numbers written at the top of your scan report are data recorded by technicians that are relevant to themselves – your name, hospital reference codes, machine calibration settings, etc.

    When the technician starts taking the ultrasound of your uterus, the uppermost image of the scan will show the tissues above your uterus. You will also see the lining, the inner side, and the back part of your uterus in the ultrasound image.

    Do ultrasound reading colors matter?

    Yes, the reading colors matter. Usually, ultrasounds are black and white, but there is a subtle difference in the shade of each tone. The different tissues in your body transmit different sounds, some reflecting and other absorbing the waves. The density of tissues is directly proportional to how white they look. Hence, the variation in the shade of the scanned tissues is due to their varying densities. In the ultrasound of your uterus, your amniotic fluid will show up as a black area. Tissues will show up as grey. If ultrasounds were to be taken of solid tissues, such as bone, they would be seen as white.

    Tips for reading a baby sonogram


    1. Stage 1

    The gestational age of the fetus will be measured by CRL (crown-rump length). This is the measurement from the top to the bottom of the bum. Then, the resulting length is matched with an internal chart to determine the baby's gestational age inside the womb.Generally, this sonography is done between 7 weeks to 13 weeks of pregnancy.

    You may also like : What To Expect In Your 7-Week Pregnancy Scan Report? (

    1. Stage 2

    The head circumference is calculated.Stage 2 is done at 13 weeks of pregnancy.

    1. Stage 3

    It involves measuring the thighbone and femur bone. This is done to find out the longitudinal growth of the baby.Stage 3 is done in the 13 weeks of pregnancy.

    1. Stage 4

    The fetus's height and length will be calculated by measuring the abdominal circumference. This is done at 20 weeks of pregnancy.

    1. Stage 5

    The fetus measurements are rechecked to check for any abnormalities. A shorter than average humerus or the femur bone or missing fetal nasal bones are symptoms of down syndrome. This is done between 20–4 weeks of pregnancy.


    An ultrasound can be done for various reasons. There are 5 types of ultrasound in pregnancy where the baby’s health in the womb and the health of the mother’s reproductive organs are monitored. Ultrasounds are also done at 5 different stages of your pregnancy. The fetus will show up as grey in the amniotic fluid, which shows up as a black area. However, remember that ultrasound reports are difficult to interpret, so always ask the doctor to help you understand your results.

    Article sources:

    Standford Children's Health Team.

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