If an infant has tufts of fine dark hair on the sacrum, which test is recommended?

In cases where an infant presents with tufts of fine dark hair on the sacrum, the recommended test is typically an ultrasound of the sacrum. This is crucial because such findings can be associated with underlying conditions like spina bifida or other spinal defects. An ultrasound provides a non-invasive and effective way to visualize the structures of the spinal cord and surrounding areas, helping to assess for abnormalities such as a tethered cord or other spinal cord anomalies.

Ultrasound is particularly advantageous in infants as it utilizes sound waves instead of radiation, making it a safer option compared to other imaging techniques. This makes it suitable for early detection and intervention if any issues are identified, which is essential in managing potential complications associated with spinal defects.

While plain radiographs can provide some information about the bony structure, they may not adequately detail soft tissue conditions or anomalies related to the spinal cord. Therefore, they are usually not the first choice in the presence of soft tissue signs like hair tufts. Genetic testing may be indicated for other conditions but is not directly relevant to the immediate concerns raised by the presence of hair tufts. In this scenario, no imaging test is not preferred, as it would not address the need to investigate potential underlying issues.