An ectopic pregnancy is a condition where a fertilized egg implants outside the uterine lining, occurring in approximately 2% ...

Add Yahoo as a preferred source to see more of our stories on Google. • A gestational sac is usually visible on a transvaginal ultrasound by 5 weeks of pregnancy or when hCG levels reach 1500 to 2000.

New criteria for the use of ultrasonography to assess prenatal viability, introduced by the Society of Radiologists in Ultrasound, will help ensure obstetricians are not too hasty in determining that ...