Doubt: Recognition or diagnostic accuracy?

We evaluate if it is correct to express the concept of diagnostic accuracy as it is almost always considered, i.e., as the sonographer's ability to recognize that specific malformation in a specific age of gestation (for example in mid-gestation). Since the malformation almost always manifests itself in a different manner as from anatomical point of view and above all in the time. In fact, the same malformation sometimes becomes visible early, sometimes late, sometimes grossly, and sometimes minimally. For this reason it is believed that the method of diagnostic accuracy used up to now must be changed and indicate how many times that anomaly is already present in that gestational age. The sonographer is also invited to always document the anatomical and biometric well-being and always keep the images or film of the ultrasound examination in the archive so as to be able to demonstrate, in medical-legal litigation, whether that fetal malformation was already present at the moment when the ultrasound examination was performed.