Question: how early can you detect an ectopic pregnancy on ultrasound?
Answer: How are they diagnosed? Trans-vaginal ultrasound examination is the best way to diagnose an ectopic pregnancy. An intra-uterine pregnancy can usually be seen by 5-6 weeks gestation or when the HCG level is >1500 IU/l. If it is not in the uterus, it may be ectopic.