There are some papers of nasal flow Doppler study … type 1 Diabetes mellitus and GDM were correlated .
I’m interested to do this … I think few disease entities can be established/ruled out by this … Notably - choanal atresia and related multiple syndromes / cleft palate and lip …
Fetal respiratory changes during stress …
Related cardiopulmonary pathology … Like lung hypoplasia/ agenesis .
Any congenital anomalies in oral cavity / tongue like macroglossia or vascular malformation or foregut cyst in tongue etc .
Other physiological changes throughout the pregnancy .
Interested Radiologist can try this I think !!