Transvaginal Ultrasonography
- More sensitive than transabdominal ultrasonography and has a lower discriminatory zone (the range of serum concentrations above which gestational sac can be visualised consistently), allowing earlier diagnoses of intrauterine or ectopic pregnancies. 8,13-15
- Superior to transabdominal US for visualising fetal anatomy and detecting fetal structural and chromosomal abnormalities. 10,11,16
- The normal intrauterine pregnancy is visible transvaginally by approximately 5 weeks from the first day of the last menstrual period. 2,3
- With regards to suspected ectopic pregnancy, patients with indeterminate ultrasonographic findings (ie. no evidence of intrauterine or ectopic pregnancy) require further evaluation with quantitative ß-hCG levels +/- follow-up US or laparoscopy. 14,17-19
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