when do the clinical manifestations of an ectopic pregnancy typically appear
Ectopic pregnancy Up to 10% of women with ectopic pregnancy have no symptoms, and one third have no medical signs.[4] In many cases the symptoms have low specificity, and can be similar to those of other genitourinary and gastrointestinal disorders, such as appendicitis, salpingitis, rupture of a corpus luteum cyst, miscarriage, ovarian torsion or urinary tract infection.[4] Clinical presentation of ectopic pregnancy occurs at a mean of 7.2 weeks after the last normal menstrual period, with a range of 4 to 8 weeks. Later presentations are more common in communities deprived of modern diagnostic ability.
Prenatal testing Non-invasive techniques include examinations of the woman's womb through ultrasonography and maternal serum screens (i.e. Alpha-fetoprotein). Blood tests for select trisomies (Down syndrome in the United States, Down and Edwards syndromes in China) based on detecting cell-free placental DNA present in maternal blood, also known as non-invasive prenatal testing (NIPT), have become available.[2] If an elevated risk of chromosomal or genetic abnormality is indicated by a non-invasive screening test, a more invasive technique may be employed to gather more information.[3] In the case of neural tube defects, a detailed ultrasound can non-invasively provide a definitive diagnosis.