Ultrasound examinations of the brain and abdomen are also recommended for newborns if necessary, and routinely for infants at 4–6 weeks of age. This can help detect anomalies that were not diagnosed during prenatal ultrasound screening. In case of brain abnormalities, upon request, it is possible to perform a developmental neurology examination. The most common anomaly observed during abdominal ultrasound examination is the dilation of the renal pelvis. In the event of such, it may be necessary to perform the required blood and urine tests as well.