A basic text and instruction manual of diagnostic ultrasound which is directed towards the student or health care provider- non-radiologist and non-sonographer- wishing to begin performing and understanding ultrasound. It covers basic concepts of diagnostic ultrasound. While the emphasis is on obstetric ultrasound, it also includes applications for gynecology, trauma, abnormal fluid collections, liver and biliary diseases, hydronephrosis and renal disease, and small parts (e.g. breast, thyroid, testicle, extremity, etc.). A primary goal is to teach the practitioner how to use ultrasound to help determine which patients should be referred to a center where a higher level of care can be provided. The book was initially conceived and created for practitioners in rural low resource areas but would be useful in a wide variety of settings.