Alveolar dead space fraction (ADF) and d-dimer assay to rule out pulmonary embolism*
| Test | Sensitivity (95% CI) | Specificity (CI) | +LR | −LR |
|---|---|---|---|---|
| *Diagnostic terms defined in glossary. | ||||
| ADF plus d-dimer | 98% (92 to 100) | 52% (46 to 57) | 2.03 | 0.03 |
| ADF alone | 67% (53 to 77) | 76% (72 to 81) | 2.83 | 0.43 |
| d-dimer alone | 94% (85 to 98) | 67% (62 to 72) | 2.85 | 0.09 |