Tag Archive for: Age-Adjusted D-Dimer

Update on Age-Adjusted D-Dimer

11 Jul
July 11, 2014

Update on Age-Adjusted D-DimerD-dimer has been shown to increase with age, which can cause a lower specificity (i.e. more false positive tests) in older patients. The result of this would be that older patients would often have more diagnostic imaging or downstream testing, but on the other hand, maybe a higher cut-off d-dimer value may lead to increased false negative cases (i.e. missed venothromboembolism) and make this strategy less safe. Recently, I wrote a post on age-adjusted d-dimer testing on REBEL EM, but since that post there was a new article that was published in Chest 2014. This post, will specifically focus on an update of age-adjusted d-dimer testing based on the above article. Read more →

Age Adjusted D-Dimer Testing

28 Apr
April 28, 2014

ThromboembolismD-dimer testing is sensitive for thrombus formation, and in patients who are not high risk, this test is used to rule-out venous thromboembolism. D-dimer has been shown to increase with age, which can cause a lower specificity (i.e. more false positive tests) in older patients.  Specificity can range from 49 – 67% in patients ≤ 50 years of age, but in older patients (i.e. ≥ 80 years of age) the specificity is quoted as 0 – 18%. The result of this is, older patients often have more diagnostic imaging, but a higher cut-off may lead to increased false negative cases (i.e. missed VTE) and make this strategy less safe. So could age adjusted d-dimer testing increase specificity without affecting sensitivity?

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