Transvaginal Versus Transabdominal Ultrasound

Jane Foley's picture


Dear Ms. Ultrasound,
I went for my first prenatal appointment at 6w3d, based on LMP. The MD could not see as sac transvaginally, but did find one transabdominally, however there was no presence of a fetal pole or yolk sac. The doctor did not do any measurements, nor did she take a blood draw. A diagnosis of a blighted ovum was given and a referral for a D and C.

I understand that this is likely not a viable pregnancy, but what would cause a sac to be seen abdominally and not vaginally? I thought it would be the opposite at this early a stage?