Version May 2024
| First-trimester ultrasonography |
| Indications for first-trimester ultrasonography include, but are not limited to, the following: |
| To confirm the presence of an intrauterine pregnancy |
| To evaluate a suspected ectopic pregnancy |
| To evaluate vaginal bleeding |
| To evaluate pelvic pain |
| To estimate gestational age |
| To diagnose or evaluate multiple gestations (eg, chorioamnionicity) |
| To confirm cardiac activity |
| As adjunct to chorionic villus sampling, embryo transfer, or localization and removal of an intrauterine device |
| To assess for certain fetal anomalies, such as anencephaly, limb abnormalities, abnormal fetal abdominal cord insertion |
| To evaluate maternal pelvic or adnexal masses or uterine abnormalities |
| To screen for fetal aneuploidy (eg, measure nuchal translucency) |
| To evaluate suspected hydatidiform mole or other gestational trophoblastic disease |
| Second- and third-trimester ultrasonography |
| Indications for second- and third-trimester ultrasonography include, but are not limited to, the following: |
| Screening for fetal anomalies |
| Evaluation of fetal anatomy |
| Estimation of gestational age |
| Evaluation of fetal growth |
| Evaluation of vaginal bleeding |
| Evaluation of abdominal or pelvic pain |
| Evaluation of cervical length |
| Determination of fetal presentation |
| Evaluation of suspected multiple gestation |
| Adjunct to amniocentesis or other procedure |
| Evaluation of a significant discrepancy between uterine size and clinical dates |
| Evaluation of a pelvic mass |
| Evaluation of a suspected hydatidiform mole or other suspected gestational trophoblastic disease |
| Adjunct to cervical cerclage placement |
| Suspected ectopic pregnancy |
| Suspected fetal death |
| Suspected uterine abnormalities |
| Evaluation of fetal well-being |
| Suspected amniotic fluid abnormalities |
| Suspected placental abruption |
| Adjunct to external cephalic version |
| Evaluation of prelabor rupture of membranes or premature labor |
| Evaluation of abnormal biochemical markers |
| Follow-up evaluation of a fetal anomaly |
| Evaluation/follow‐up of placental appearance and location, including suspected placenta previa, vasa previa, and abnormally adherent placenta |
| History of previous congenital anomaly |
| Evaluation of the fetal condition in late registrants for prenatal care |
| Assessment for findings that may increase the risk of aneuploidy |
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