Ultrasound probably would not "see" a tiny fragment of placenta, but would
show if the endometrial cavity was larger than expected--although the
range of normal may be quite large in the postpartum period.  It is
certainly less invasive than a D&C, and may be useful, but it is possible
to do D&C's under local anethesia in the office, so this may be an option
if this is a persistent concern.

--
Anne Montgomery, M.D.
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St.Peter Hospital Family Practice Residency
Olympia,WA