Diagnostic and Concerning Features of Obstetrical Ultrasound

Obstetrical Ultrasound

Is the evaluation of changes and alterations occurring in the fetus and the pelvic cavity of the mother during pregnancy, which includes embryogenesis and structural changes usually of the size of the pelvic cavity. These diagnostic and concerning features are seen during the first trimester of the gestation.

Diagnostic Features that Conforms non-viable Pregnancy

1. Crown to rump length greater than 7mm with no evaluation of embryo confirms non-viable pregnancy.
2. Mean sac diameter greater than 25mm with no visualization of yolk sac and embryo confirms non-viable pregnancy.
3. If the embryo and cardiac activity are not seen after:

•    Two or more weeks of the visualization of the gestational sac
• 9 to 10 days following visualization of gestational and yolk sac

Concerning Features that are not Diagnostic Features of non-viable Pregnancy

1. The crown to rump length less than 7mm favors viable pregnancy.
2. Mean sac diameter less than 25mm will result in viable pregnancy.
3. An empty amnion sign. 
4. Double belb sign.
5. Misshapen gestational sac (irregular, thin hypoechogenic peripheral rim)
6. Large amnion relative to the embryo.
7. Dislocation of the gestational sac.
8. Small gestational sac relative to the embryo, the condition is termed as oligohydramnios
9. Abnormal heartbeat rate, lower than 90bps before 6.3 weeks of gestation and lower than 110bps greater than 7 to 10 weeks of gestation, the condition is termed as bradycardia.
10. No embryo with cardiac activity is seen after 6 weeks of gestation or last menstrual cycle.
11. Chorionic bump.
12. Abnormal appearing