Table 2

Sensitivity, specificity, negative, and positive predictive values (NPV, PPV) and likelihood ratios (LR) for SimpliRED d-dimer testing as performed by all grades of emergency department medical staff on adult patients presenting with suspected DVT having been assessed using the clinical prediction model

ParameterPoint estimate95% CI
Sensitivity (%)63.448.1 to 76.4
Specificity (%)74.868.9 to 79.9
PPV (%)30.221.5 to 40.6
NPV (%)92.287.6 to 95.2
LR of (+) test2.521.83 to 3.46
LR of (−) test0.490.32 to 0.74