Table 1 Screening of potential false negatives
Patient Age | D-dimer result (FEU) | Age Adjusted Cut off (age × 10) (FEU) | Well’s Score | Reference Standing Imaging | Decision |
|---|---|---|---|---|---|
91 | 572 | 910 | Not calculated (however DVT was listed as number listed differential) | CUS- partial non occlusive common femoral vein DVT | Exclude- high clinical suspicion and non-occlusive thrombus |
89 | 496 | 890 | 6 | CTPA- VTE positive | Exclude- high pre-test probability |
85 | 622 | 850 | Not calculated. However high risk as previous DVT | CUS- VTE positive | Exclude- non occlusive thrombus |
85 | 654 | 850 | 2 | CUS- small non occlusive thrombus suggested | Exclude- non occlusive thrombus |
81 | 592 | 810 | Not calculated. Immediately post operatively | CUS– non occlusive chronic thrombus | Exclude – chronic thrombus |
76 | 642 | 760 | Not calculated. 3 week history of thrombophlebitis | CUS- positive for thrombophlebitis | Exclude- thrombophlebitis |
75 | 300 | 750 | Not calculated | CUS- non occlusive chronic thrombus | Exclude- chronic thrombus |
75 | 544 | 750 | 5 | CUS- VTE positive | Exclude- high pre-test probability |
77 | 704 | 770 | Not calculated. 4 from data available | CUS- VTE positive | Exclude- high pre-test probability |
53 | 504 | 530 | Not calculated | CTPA – VTE positive | Include as false negative |
46 | 462 | 460 | Not calculated | CUS- VTE positive, however repeat scan negative | Exclude patient < 50 so normal cut off would be used |
73 | 670 | 730 | Not calculated. 2–3 day history of swollen ankle. Received subcutaneous thromboplastin | CUS- VTE positive | Exclude – high pre-test probability |
84 | 634 | 840 | Not calculated. No data available | CTPA- VTE positive | Include as false negative |
84 | 628 | 840 | Not calculated No data available | CTPA- VTE positive | Exclude- repeat CTPA in the above patient during same admission |
60 | 600 | 600 | -1 | CUS- VTE positive | Include as a false negative |
88 | 480 | 880 | 2, high clinical suspicion | CUS- VTE positive | Exclude- high pre-test probability |
84 | 764 | 840 | 3 | CUS- VTE positive | Exclude- high pre-test probability |
83 | 692 | 830 | 3 | CUS- VTE positive | Exclude- high pre-test probability |
76 | 656 | 760 | Not calculated | CUS- partial non occlusive thrombus in the superficial femoral vein – not treated | Exclude- non occlusive thrombus. Not treated |
93 | 546 | 930 | 3 | CUS- VTE positive | Exclude-high pre-test probability |