Table 3.

 Summary of medical history of two women adjudicated as having proximal deep vein thrombosis during three month follow-up

Variables	Patient A	Patient B
Age (years)	25	23
Body mass index	27.3	21.9
Stage of pregnancy (weeks)	34	29
Risk factors	0	0
Clinical probability of deep vein thrombosis:
Low
Intermediate	Yes	Yes
High
Initial compression ultrasonography:
All venous segments imaged	Yes	Yes
Ileocaval junction imaged	Yes	Yes
Respiratory modulation of iliac blood flow	Yes	No
Compression ultrasonography result	Normal	Normal
Compression ultrasonography during follow-up:
Date	Day 1	Day 15
Result	Left iliofemoral deep vein thrombosis	Left iliofemoral deep vein thrombosis
Comments	Returned to emergency unit next day because of increasing symptoms. Compression ultrasonography result was clearly positive for deep vein thrombosis	Was admitted for premature labour 15 days before initial suspicion. Emergency caesarean section carried out five days after initial suspicion. Suspected deep vein thrombosis confirmed by compression ultrasonography on postoperative day 5