Sonographic Normal Thyroid Lobe Measurements (cm)
| Age | Transverse (cm) | Longitudinal (cm) | AP (cm) |
| Infants and Young Children | 1 - 1.5 | 2 - 3 | 0.2 - 1.2 |
| Adolescents & Adults | 2 - 4 | 5 - 8 | 1 - 2.5 |
Cole-Beuglet C. Ultrasonography of the thyroid, parathyroid and neck masses. In: Sarti DA, ed. Diagnostic ultrasound: text and cases. Chicago: Year Book Medical Publishers; 1987:608-618. (Modified)