How thick must the uterine lining be for transfer?
Most of the literature suggests that an optimal uterine lining should be somewhere between 7 – 12 mm in thickness on the day of hCG trigger. These values are not absolute. Our clinic has had implantation with a lining as thin as 3.5 mm. What should you see on sonogram in a pregnancy at 4, 5, 6, 7, 8, and 9 weeks? At 4 weeks of gestational age (2 weeks post conception), your doctor should only be able to see a thickened uterine stripe. At 5 weeks of gestational age (3 weeks post conception), the presence of a gestational sac and possibly a yolk sac are seen. At 6 weeks of gestational age (4 weeks post conception), your doctor should be able to see a gestational sac and a yolk sac. Fifty percent of the time, a fetal pole will be seen with cardiac activity. At 7 weeks of gestational age (5 weeks post conception), ninety percent of the time, a fetal pole will be seen with cardiac activity. At 8 weeks of gestational age (6 weeks post conception), your doctor should see all of the previously
