Management of Subchorionic Hematoma on Obstetric Ultrasound

Initial Diagnostic Assessment

The American College of Obstetricians and Gynecologists recommends documenting the location of the subchorionic hematoma relative to the placenta using transvaginal ultrasound as the primary imaging modality 1
The American College of Obstetricians and Gynecologists recommends documenting the presence of fetal cardiac activity using M-mode ultrasound or video clips, avoiding pulsed Doppler in the first trimester due to potential bioeffects on the developing embryo 1
The American College of Obstetricians and Gynecologists recommends obtaining quantitative beta-hCG level and complete blood count to assess for anemia and trend hormone levels 1
The American College of Obstetricians and Gynecologists recommends obtaining blood type and screen if not already on file, particularly to identify Rh-negative patients 1

The American College of Obstetricians and Gynecologists recommends that prognosis is favorable when fetal cardiac activity is present 1
The American College of Obstetricians and Gynecologists recommends serial ultrasound examinations at 7-day intervals until bleeding ceases, hematoma disappears, or pregnancy outcome is determined 2

The American College of Chest Physicians recommends immediately discontinuing DOACs and switching to low molecular weight heparin if subchorionic hematoma is detected in a woman on anticoagulation 2
The International Society on Thrombosis and Haemostasis recommends early obstetric review and enhanced fetal monitoring, including assessment for subchorionic/retroplacental bleeding 3
The International Society on Thrombosis and Haemostasis recommends detailed first trimester scan (11-13+6 weeks) and anomaly scan (18-23 weeks) performed by an experienced sonologist 3
The International Society on Thrombosis and Haemostasis recommends additional ultrasounds to monitor for fetal growth, well-being, and intracranial bleeding for DOAC exposure beyond the first trimester 3

The American College of Obstetricians and Gynecologists recommends not using pulsed Doppler ultrasound in the first trimester for cardiac activity assessment; instead, use M-mode to avoid potential bioeffects 1
The American College of Obstetricians and Gynecologists recommends not confusing early first trimester subchorionic hematoma with normal decidual bleeding or other placental abnormalities like subamniotic hematomas 1
The American College of Obstetricians and Gynecologists recommends not overlooking Rh status—failure to administer anti-D immunoglobulin can lead to alloimmunization 1