We were talking about this in conference today and there were some minor disagreements, so I was wondering how you like handle it at your shops. If low risk do you still use d-dimer? If so, do you use the typical normal range, or does your lab have pregnancy-corrected values? Then what, do you go for bilateral leg US's, followed by rx or d/c, or do you proceed w/ more imaging? How about high risk; routinely get leg US's prior to chest imaging? Then what imaging do you go for: CTPA, knowing it's higher radiation for the fetus, or V/Q, given that it's lower overall, especially for the breast.