• Jonathan Dutton, Martin Dachsel, and Rachel Crane.
• Surrey and Sussex Healthcare Trust, East Surrey Hospital, Redhill, UK jonathan.dutton@doctors.org.uk.
• Clin Med (Lond). 2018 Aug 1; 18 (4): 293296293-296.

AbstractSafe exclusion of pulmonary embolism (PE) is a common problem in acute medicine. Common care pathways usually involve the use of a pre-test probability score with a D-dimer test to aid clinical decision-making. Unfortunately, the specificity of many D-dimer assays decreases with age. This study investigates the role of an age-adjusted D-dimer of 5 x patient's age when the conventional cut-off of the assay is 230 ng/mL. Data was collected retrospectively over a 12-month period from patients who went on to have either computed tomography pulmonary angiography (CTPA) or pulmonary ventilation/perfusion (V/Q) imaging. D-dimers in patients with low or moderate Wells score were analysed for both conventional and age-adjusted cut-offs. The use of an adjusted D-dimer showed a sensitivity of 0.97 (95% CI 0.9-1.0) while the specificity increased from 0.07 (95% CI 0.04-0.11) for the conventional cut-off to 0.32 (95% CI 0.27-0.38) for the age-adjusted cut-off. Using a 5 x patient's age-adjusted D-dimer cut-off is both safe and showed an increased specificity comparable to those published previously on other D-dimer assays.© Royal College of Physicians 2018. All rights reserved.

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