The anatomy scan, often called a Level 2 ultrasound or anomaly scan, is a non-invasive examination routinely performed during the second trimester, typically between 18 and 22 weeks of pregnancy. This detailed ultrasound allows healthcare providers to assess the developing fetus, checking the growth, size, and structure of all major organ systems, including the heart, brain, spine, and limbs. The question of whether to eat beforehand is common; the general consensus is that eating is usually permitted and often beneficial. However, you must always confirm the specific instructions provided by your clinic.
The General Rule: Eating and Hydration
Fasting is not required for a second-trimester anatomy scan. Many providers suggest maintaining your normal eating schedule to avoid feeling lightheaded or uncomfortable during the 30- to 60-minute procedure. Opting for a light, easily digestible meal is preferred over a heavy, fatty one that might cause maternal discomfort.
Being well-hydrated is another important factor that can directly influence the quality of the ultrasound images. Water helps transmit the sound waves more effectively, contributing to clearer views of the fetus and the surrounding amniotic fluid. Drinking water in the hour leading up to the appointment assists in achieving this clarity, even if a full bladder is not specifically requested.
Encouraging Fetal Activity for Optimal Viewing
Eating before the scan is frequently encouraged because it can help stimulate the fetus into a more favorable position. When the mother consumes food, the resulting rise in maternal blood glucose levels transfers to the fetus, leading to a natural increase in movement and wakefulness. This temporary boost in activity is often what the sonographer needs to complete the comprehensive examination.
Fetal movement allows the technician to obtain clear images of structures that may be difficult to view if the baby is resting in one spot. For instance, a change in position can help visualize all four chambers of the heart or get a complete profile of the spine. If the baby is initially uncooperative, the sonographer might ask the mother to consume a small amount of juice or take a brief walk to encourage activity.
Other Essential Preparation Steps
Beyond food and drink, there are several other practical steps for preparation. You should wear comfortable, loose-fitting clothing, ideally a two-piece outfit, so the sonographer can easily access your abdomen. The entire procedure generally takes between 30 minutes and an hour, depending on how cooperative the fetus is throughout the session.
Regarding bladder preparation, instructions can vary significantly between facilities. While a full bladder is often necessary for very early pregnancy scans, at 20 weeks, some clinics request a partially full bladder, while others ask for an empty one. You must confirm this specific requirement with your provider beforehand to avoid delays or the need to reschedule. If a complete set of images cannot be obtained during the first attempt due to poor positioning, your provider may schedule a brief follow-up scan.