Plagiocephaly is typically diagnosed through clinical observation and physical examinations. Radiographic imaging, such as X-rays, ultrasounds, MRIs, and CT scans, can be used to determine the presence of craniosynostosis, a more severe condition. 3D reconstructions of the skull can also aid in detecting craniosynostosis. A diagonal caliper is a simple and cost-effective tool for measuring the asymmetry of the head. However, there may be errors in measurements due to factors like scalp thickness and hair, which can affect the accuracy of assessing severity. Studies have shown that imaging data can help reduce these errors.