Your doctor will perform three ultrasounds over the course of your pregnancy check-ups. The dates fall between the 8th and 12th weeks of pregnancy, the 18th and 22nd weeks of pregnancy and between the 28th and 32nd weeks of pregnancy. During an ultrasound scan, also called a sonography, you can see images of the fetus through on a screen. This experience can be a happy one and may strengthen your bond to the baby. The examinations are important from a medical point of view. Doctors can see exactly how the fetus is developing and can take action if something is wrong.

Sonography is painless for you and safe the fetus. The person performing the exam applies a special gel to your abdomen and then slides a transducer over your stomach. This transducer emits a sound too high for your ears to hear. The computer can then calculate an image using the time interval between the sound and its echo. This allows you to see the baby in your belly for the first time. An exam conducted through the abdominal wall is done with what is known as ‘abdominal ultrasonography’. An examination in which the transducer is inserted into the vagina is vaginal ultrasonography. This method is used mainly in the early stages of pregnancy. It provides more accurate images of the embryo, which is still very small at this time.

During the first ultrasound examination, your doctor will confirm that you are pregnant. The heartbeat and shape of the embryo can be seen. Its length can also be determined with the help of the ultrasound scanner. The distance between the coccyx and the top of the embryo's head is measured. Your doctor can get a good estimate of the actual age of the embryo this way. It is possible that the due date in your maternity record (Mutterpass) will have to be updated again. The first ultrasound scan can also tell you if there is only one baby on the way or if you are expecting twins or more multiples.

At this appointment you will have the choice between a basic ultrasound examination and an extended examination. Your health insurance should cover the cost in either case. During a basic ultrasound exam, your doctor will measure the size of the fetus's head, the circumference of its abdomen, and the length of its femur. The amount of amniotic fluid, the position and stricture of the placenta and the fetal heartbeat will also be checked. Additional measurements are taken during an extended basic ultrasound examination. These include, for example, the fetus’s cerebellum, the ventricles of the brain and the ventricles of the heart. The examine will also determine whether the fetus's abdominal wall and spine are closed. This kind of examination, which looks at the fetus’s organs, is also called obstetric ultrasonography in English. Your doctor must provide you with a written explanation before an extended ultrasound. That means you will get a description of how the examination works and what the procedure can and cannot determine in terms of its informative value compared to the extended basic ultrasound. If you don't understand something or have questions, speak up right away. After this explanation, your doctor will ask whether you would like a basic ultrasound or the extended version.

It's only two months before delivery. Therefore, doctors don’t just check whether the baby is developing on the right track. With the help of the ultrasound, they can also determine the baby’s position. This is important for assessing possible birth risks in good time. During this check-up the amount of amniotic fluid and the condition of the placenta are checked again.

Your health insurance only covers the costs of additional ultrasound examinations if there is an important reason, for example if there might be something wrong with the fetus. This could be the case, for example, if there is uterine bleeding, a suspicion that the fetus may have a defect or be in an unfavourable position after the 36th week of pregnancy. All abnormalities that could be cause for further examinations are listed in the official German maternity guidelines (Mutterschaftsrichtlinien) appendices 1b, 1c and 1d. There are also special kinds of ultrasounds that are used in special medical cases. These include Doppler ultrasound and 3D ultrasound. These additional examinations are entered on pages 12 and 14 of your maternity record (Mutterpass)

The vast majority of ultrasound scans show a healthy, normal baby. However, in cases where diseases or changes do become apparent, ultrasound helps to take important medical steps at an early stage. That is why this kind of examination is part of preventive care.

In principle, however, an ultrasounds cannot detect all defects. They cannot detect genetic disorders, metabolic diseases or diseases that do not cause physical changes. Also, if the fetus is in an awkward position or if you have a particularly thick abdominal wall, the validity of the examination may be limited.

FS: Amniotic sac diameter

SSL (Crown-rump length, Scheitel-Steiß-Länge): The length of the embryo or fetus from head to buttocks

BPD (Biparietal diameter): The diameter of the head measured transversely

FOD (Fronto-occipital diameter): The longitudinal diameter of the head

KU: Head circumference-

ATD (Abdominal transverse diameter): Dimension of the abdomen from one side to the other

APD (Anterior-posterior diameter): Front-to-back measurement of the abdomen

AU (Abdominal circumference): Girth of the abdomen

FL (Femur length): Length of the thigh bone