Anomaly scan

The anomaly scan, also known as the anatomy scan, 20-week scan, or level II ultrasound, is a detailed ultrasound examination performed during pregnancy. This scan is typically conducted between the 18th and 21st week of gestation. The primary purpose of the anomaly scan is to check for structural abnormalities in the developing fetus.

Purpose

The anomaly scan is a routine part of prenatal care in many countries. It provides an opportunity to examine the fetus's anatomy in detail, to ensure that development is proceeding normally. The scan can detect a wide range of potential congenital anomalies, including heart defects, spinal abnormalities, and cleft palate. It also allows for the assessment of the placenta, amniotic fluid, and umbilical cord.

Procedure

The anomaly scan is a non-invasive procedure performed by a trained sonographer. The sonographer applies a gel to the mother's abdomen and uses a handheld device called a transducer to send sound waves into the uterus. These sound waves bounce off structures in the uterus, creating images on a monitor.

During the scan, the sonographer systematically examines all parts of the fetus's body. Measurements are taken of the head, abdomen, and limbs to assess growth. The sonographer also checks the position of the placenta, the amount of amniotic fluid, and the general well-being of the fetus.

Limitations

While the anomaly scan can detect many structural abnormalities, it is not infallible. Some anomalies may not be visible or may not develop until later in pregnancy. Additionally, the scan cannot detect all types of genetic or chromosomal disorders. Further testing may be recommended if the scan reveals potential concerns or if there is a high risk of certain conditions based on the mother's age, family history, or other factors.

See Also

• Ultrasound
• Prenatal care
• Congenital anomalies
• Genetic disorders

• Human placenta and umbilical cord ultrasound
  Human placenta and umbilical cord ultrasound
• Lemon and banana sign for neural tube defect
  Lemon and banana sign for neural tube defect
• Fetal kidney perfusion and fetal breathing activity
  Fetal kidney perfusion and fetal breathing activity