Adequate level of prenatal ultrasound scan is a prerequisite for a successful definition of high risk population that needs further investigations. "Basic", standardized fetal mid-trimester scan, with an informative report enables not only diagnosis of anomaly but also evaluation of state of pregnancy in general. This paper was aimed at reviewing the benefits of and requirements for a complete basic mid-trimester fetal ultrasound scan and the necessary documentation. Potential directions for development of organization of basic mid-trimester fetal ultrasound scans are standardization of the scan, with establishing the number and the level of examination, and continual education of both the doctors and the patients. In order to standardize the exam, a uniform check list is needed, so that the examination should always be done in the same manner and at the same level, no matter where it is done and by whom. International and national guidelines should be agreed upon and they should state clear standards on who should do the scan, how, what kind of ultrasound machine should be used and what documentation should be kept. This paper presents a possible standardization of basic level mid trimester fetal ultrasound scan. A routine complete second trimester ultrasound between 18 and 22 weeks and a complete ultrasound report will provide the best opportunity to diagnose fetal anomalies and to help in the management of prenatal care. It will also reduce the unnecessary number of ultrasound examinations done during the second trimester for completion of fetal anatomy survey, which would decrease the costs.