The OB Ultrasound Case Review System is a proprietary online library for interpretation and assessment. The first section covers ultrasound exams in the first trimester of pregnancy. This section develops the student’s skills in interpreting: correct dating measurements, twin gestation, benign findings, congenital abnormalities, ectopic and molar pregnancies. The second section reviews ultrasound exams in the 2nd and 3rd trimester. This section instructs the students in interpreting growth, twin gestation, fluid assessment, congenital abnormalities, and pathology. The OB Ultrasound Case Review System is a valuable learning tool in developing the skills needed to accurately interpret obstetric ultrasound examinations.