Does a major anomaly scan check the fetus's fingers and toes?

Generally, during a major anomaly scan, the number and general morphology of the fetal fingers and toes are examined. If the fetal position is favorable and there is sufficient amniotic fluid, these structures can be clearly visualized. However, if the fetal position is suboptimal, amniotic fluid is insufficient, or certain areas are obstructed, complete observation may not be possible. If concerns arise, it is recommended to consult a healthcare provider in advance. Detailed explanations are as follows:

When the fetus is in an optimal position during the examination—such as with hands and feet naturally extended and unobstructed—and when adequate amniotic fluid provides good acoustic transmission, doctors can clearly observe the number of fingers and toes via ultrasound, checking for obvious abnormalities such as polydactyly (extra digits) or oligodactyly (missing digits), and record relevant findings to ensure major structural anomalies are ruled out.

If the fetus has clenched fists, tightly pressed legs, or body posture that obscures the hands and feet, or if low amniotic fluid impairs ultrasound penetration, the resulting images may be blurry. In such cases, doctors may have difficulty clearly distinguishing the details of fingers and toes, making it challenging to accurately assess their number or shape. These limitations are not due to oversight during the scan but rather reflect inherent physical constraints, necessitating follow-up scans for confirmation.

Prior to the major anomaly scan, light physical activity may help encourage fetal movement and repositioning. During the scan, cooperate with the sonographer’s instructions regarding positioning. If hands and feet are not clearly visible during the initial scan, schedule a follow-up appointment as advised by your doctor. Avoid excessive anxiety over incomplete visualization during a single session; instead, follow professional medical guidance and complete any recommended subsequent evaluations to ensure comprehensive assessment of fetal health.