Page 23 - SONO 260 The Fetal Head and Brain

FETAL HEAD MEASUREMENTS OCCIPITOFRONTAL DIAMETER
The occipitofrontal diameter (OFD) is obtained at the same level of the BPD and HC.
— The OFD is measured from the outside of the occipital bone to outside of the frontal bone, along the midline of the fetal cranium.
— The OFD may also be called the frontooccipital diameter.
— It can be added to the BPD and multiplied by 1.57 to obtain a head circumference as well.