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Table 3 Studies of repeat US

From: Systematic review and meta-analysis of the diagnostic accuracy of ultrasonography for deep vein thrombosis

Author & date of publication Group Number (%) of initial scans positive Number (%) of repeat scans positive Number (%) of positive scans (initial or repeat) confirmed by venography
Heijboer, 1993 [109] All patients 93/491 (19%) 7/397 (1.8%) 84/89 (94%)
Cogo, 1998 [110] All patients 400/1702 (24%) 12/1252 (1.0%) -
Sluzewski, 1991 [111] All patients 67/174 (39%) 0/98 (0%) -
Birdwell, 1998 [112] All patients 63/405 (16%) 7/342 (2.0%) 23/28 (82%)
Birdwell, 2000 [113] All patients 95/709 (13%) 9/521 (1.7%) 39/47 (83%)
Studies of unselected patients combined    35/2610 (1.34%) 146/164 (89.0%)
Bernardi, 1998 [116] Positive D-dimer 260/946 (27%) 5/88 (5.7%) -
Kraaijenhagen, 2002 [117] Positive D-dimer 391/1739 (22%) 17/518 (3.0%) -
Studies of patients with a positive D-dimer combined    22/606 (3.63%) -
Wells, 1997 [114] Intermediate Wells score 27/193 (14%) 3/166 (1.8%) -
Tick, 2002 [115] Intermediate or high Wells score & positive D-dimer 300/531 (57%) 13/83 (15.7%) -